20727723864 has 32 divisors (see below), whose sum is σ = 51830763120. Its totient is φ = 6907714176.

The previous prime is 20727723839. The next prime is 20727723917. The reversal of 20727723864 is 46832772702.

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, 18162 + ... + 204414.

Almost surely, 2^20727723864 is an apocalyptic number.

20727723864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20727723864 is an abundant number, since it is smaller than the sum of its proper divisors (31103039256).

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

20727723864 is a wasteful number, since it uses less digits than its factorization.

20727723864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190899 (or 190895 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 48.

The spelling of 20727723864 in words is "twenty billion, seven hundred twenty-seven million, seven hundred twenty-three thousand, eight hundred sixty-four".