20500003600 has 60 divisors (see below), whose sum is σ = 49281344676. Its totient is φ = 8194992640.

The previous prime is 20500003549. The next prime is 20500003603. The reversal of 20500003600 is 630000502.

It can be written as a sum of positive squares in 6 ways, for example, as 2770548496 + 17729455104 = 52636^2 + 133152^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20500003603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 678414 + ... + 707986.

Almost surely, 2^20500003600 is an apocalyptic number.

20500003600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20500003600 is an abundant number, since it is smaller than the sum of its proper divisors (28781341076).

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

20500003600 is a wasteful number, since it uses less digits than its factorization.

20500003600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31324 (or 31313 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The spelling of 20500003600 in words is "twenty billion, five hundred million, three thousand, six hundred".