20587985100 has 108 divisors (see below), whose sum is σ = 65625825720. Its totient is φ = 5397062400.

The previous prime is 20587985087. The next prime is 20587985111. The reversal of 20587985100 is 158978502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 140761 + ... + 246960.

Almost surely, 2^20587985100 is an apocalyptic number.

20587985100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20587985100 is an abundant number, since it is smaller than the sum of its proper divisors (45037840620).

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

20587985100 is a wasteful number, since it uses less digits than its factorization.

20587985100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387800 (or 387790 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The spelling of 20587985100 in words is "twenty billion, five hundred eighty-seven million, nine hundred eighty-five thousand, one hundred".