20215255100 has 18 divisors (see below), whose sum is σ = 43867103784. Its totient is φ = 8086102000.

The previous prime is 20215255091. The next prime is 20215255111. The reversal of 20215255100 is 155251202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101076176 + ... + 101076375.

Almost surely, 2^20215255100 is an apocalyptic number.

20215255100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20215255100 is an abundant number, since it is smaller than the sum of its proper divisors (23651848684).

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

20215255100 is a wasteful number, since it uses less digits than its factorization.

20215255100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202152565 (or 202152558 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The spelling of 20215255100 in words is "twenty billion, two hundred fifteen million, two hundred fifty-five thousand, one hundred".