19996620 has 96 divisors (see below), whose sum is σ = 65415168. Its totient is φ = 4468992.

The previous prime is 19996597. The next prime is 19996621. The reversal of 19996620 is 2669991.

It is a happy number.

It is a super-2 number, since 2×19996620² = 799729622848800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (19996621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19234 + ... + 20246.

It is an arithmetic number, because the mean of its divisors is an integer number (681408).

Almost surely, 2^19996620 is an apocalyptic number.

19996620 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 19996620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32707584).

19996620 is an abundant number, since it is smaller than the sum of its proper divisors (45418548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19996620 is a wasteful number, since it uses less digits than its factorization.

19996620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 19996620 is about 4471.7580435439. The cubic root of 19996620 is about 271.4264695788.

The spelling of 19996620 in words is "nineteen million, nine hundred ninety-six thousand, six hundred twenty".