20911100100 has 72 divisors (see below), whose sum is σ = 66003046368. Its totient is φ = 5069356800.

The previous prime is 20911100083. The next prime is 20911100131. The reversal of 20911100100 is 100111902.

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 20911100100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3165049 + ... + 3171648.

Almost surely, 2^20911100100 is an apocalyptic number.

20911100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20911100100 is an abundant number, since it is smaller than the sum of its proper divisors (45091946268).

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

20911100100 is a wasteful number, since it uses less digits than its factorization.

20911100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336725 (or 6336718 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 15.

The spelling of 20911100100 in words is "twenty billion, nine hundred eleven million, one hundred thousand, one hundred".