20291911100 has 18 divisors (see below), whose sum is σ = 44033447304. Its totient is φ = 8116764400.

The previous prime is 20291911049. The next prime is 20291911109. The reversal of 20291911100 is 111919202.

It is a self number, because there is not a number n which added to its sum of digits gives 20291911100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20291911109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101459456 + ... + 101459655.

It is an arithmetic number, because the mean of its divisors is an integer number (2446302628).

Almost surely, 2^20291911100 is an apocalyptic number.

20291911100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20291911100 is an abundant number, since it is smaller than the sum of its proper divisors (23741536204).

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

20291911100 is a wasteful number, since it uses less digits than its factorization.

20291911100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202919125 (or 202919118 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 20291911100 in words is "twenty billion, two hundred ninety-one million, nine hundred eleven thousand, one hundred".