20706164864 has 64 divisors (see below), whose sum is σ = 51429297600. Its totient is φ = 8067333120.

The previous prime is 20706164863. The next prime is 20706164867. The reversal of 20706164864 is 46846160702.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (20706164863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1040579 + ... + 1060290.

It is an arithmetic number, because the mean of its divisors is an integer number (803582775).

Almost surely, 2^20706164864 is an apocalyptic number.

It is an amenable number.

20706164864 is an abundant number, since it is smaller than the sum of its proper divisors (30723132736).

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

20706164864 is a wasteful number, since it uses less digits than its factorization.

20706164864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100901 (or 2100889 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 20706164864 in words is "twenty billion, seven hundred six million, one hundred sixty-four thousand, eight hundred sixty-four".