20664023700 has 72 divisors (see below), whose sum is σ = 59846794560. Its totient is φ = 5504979200.

The previous prime is 20664023693. The next prime is 20664023711. The reversal of 20664023700 is 732046602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 275896 + ... + 342704.

It is an arithmetic number, because the mean of its divisors is an integer number (831205480).

Almost surely, 2^20664023700 is an apocalyptic number.

20664023700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20664023700 is an abundant number, since it is smaller than the sum of its proper divisors (39182770860).

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

20664023700 is a wasteful number, since it uses less digits than its factorization.

20664023700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67857 (or 67850 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The spelling of 20664023700 in words is "twenty billion, six hundred sixty-four million, twenty-three thousand, seven hundred".