20431890228 has 24 divisors (see below), whose sum is σ = 47879028288. Its totient is φ = 6781398976.

The previous prime is 20431890163. The next prime is 20431890247. The reversal of 20431890228 is 82209813402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3650976 + ... + 3656567.

It is an arithmetic number, because the mean of its divisors is an integer number (1994959512).

Almost surely, 2^20431890228 is an apocalyptic number.

It is an amenable number.

20431890228 is an abundant number, since it is smaller than the sum of its proper divisors (27447138060).

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

20431890228 is a wasteful number, since it uses less digits than its factorization.

20431890228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7307783 (or 7307781 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 20431890228 in words is "twenty billion, four hundred thirty-one million, eight hundred ninety thousand, two hundred twenty-eight".