20431894700 has 72 divisors (see below), whose sum is σ = 51530035200. Its totient is φ = 6886474560.

The previous prime is 20431894699. The next prime is 20431894733. The reversal of 20431894700 is 749813402.

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, 206060 + ... + 288659.

Almost surely, 2^20431894700 is an apocalyptic number.

20431894700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20431894700 is an abundant number, since it is smaller than the sum of its proper divisors (31098140500).

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

20431894700 is a wasteful number, since it uses less digits than its factorization.

20431894700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494799 (or 494792 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 20431894700 in words is "twenty billion, four hundred thirty-one million, eight hundred ninety-four thousand, seven hundred".