20856632100 has 36 divisors (see below), whose sum is σ = 60345189744. Its totient is φ = 5561768480.

The previous prime is 20856632099. The next prime is 20856632129. The reversal of 20856632100 is 123665802.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34760754 + ... + 34761353.

Almost surely, 2^20856632100 is an apocalyptic number.

20856632100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20856632100 is an abundant number, since it is smaller than the sum of its proper divisors (39488557644).

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

20856632100 is a wasteful number, since it uses less digits than its factorization.

20856632100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69522124 (or 69522117 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 20856632100 in words is "twenty billion, eight hundred fifty-six million, six hundred thirty-two thousand, one hundred".