| Base | Representation |
|---|---|
| bin | 100101100000… |
| … | …1000000011000 |
| 3 | 1101000002012101 |
| 4 | 1023001000120 |
| 5 | 20013234140 |
| 6 | 1541253144 |
| 7 | 326102062 |
| oct | 113010030 |
| 9 | 41002171 |
| 10 | 19664920 |
| 11 | 10111600 |
| 12 | 67041b4 |
| 13 | 40c6a62 |
| 14 | 287c732 |
| 15 | 1ad699a |
| hex | 12c1018 |
19664920 has 96 divisors (see below), whose sum is σ = 51710400. Its totient is φ = 6702080.
The previous prime is 19664899. The next prime is 19664923. The reversal of 19664920 is 2946691.
It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.
It is a self number, because there is not a number n which added to its sum of digits gives 19664920.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (19664923) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82161 + ... + 82399.
It is an arithmetic number, because the mean of its divisors is an integer number (538650).
Almost surely, 219664920 is an apocalyptic number.
19664920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 19664920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25855200).
19664920 is an abundant number, since it is smaller than the sum of its proper divisors (32045480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
19664920 is a wasteful number, since it uses less digits than its factorization.
19664920 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 289 (or 274 counting only the distinct ones).
The product of its (nonzero) digits is 23328, while the sum is 37.
The square root of 19664920 is about 4434.5146295846. The cubic root of 19664920 is about 269.9173043499.
It can be divided in two parts, 1966 and 4920, that added together give a palindrome (6886).
The spelling of 19664920 in words is "nineteen million, six hundred sixty-four thousand, nine hundred twenty".
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