20155204100 has 36 divisors (see below), whose sum is σ = 43744939728. Its totient is φ = 8060580000.

The previous prime is 20155204067. The next prime is 20155204127. The reversal of 20155204100 is 140255102.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 633575 + ... + 664625.

Almost surely, 2^20155204100 is an apocalyptic number.

20155204100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20155204100 is an abundant number, since it is smaller than the sum of its proper divisors (23589735628).

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

20155204100 is a wasteful number, since it uses less digits than its factorization.

20155204100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37556 (or 37549 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 20155204100 its reverse (140255102), we get a palindrome (20295459202).

The spelling of 20155204100 in words is "twenty billion, one hundred fifty-five million, two hundred four thousand, one hundred".