20501700 has 72 divisors (see below), whose sum is σ = 60954432. Its totient is φ = 5316480.

The previous prime is 20501699. The next prime is 20501731. The reversal of 20501700 is 710502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20501700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10177 + ... + 12023.

Almost surely, 2^20501700 is an apocalyptic number.

20501700 is a gapful number since it is divisible by the number (20) 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 20501700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30477216).

20501700 is an abundant number, since it is smaller than the sum of its proper divisors (40452732).

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

20501700 is a wasteful number, since it uses less digits than its factorization.

20501700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901 (or 1894 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 20501700 is about 4527.8802987712. The cubic root of 20501700 is about 273.6927488123.

The spelling of 20501700 in words is "twenty million, five hundred one thousand, seven hundred".