20358161664 has 36 divisors (see below), whose sum is σ = 54182401056. Its totient is φ = 6786053632.

The previous prime is 20358161647. The next prime is 20358161693. The reversal of 20358161664 is 46616185302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13253244 + ... + 13254779.

It is an arithmetic number, because the mean of its divisors is an integer number (1505066696).

Almost surely, 2^20358161664 is an apocalyptic number.

20358161664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20358161664 is an abundant number, since it is smaller than the sum of its proper divisors (33824239392).

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

20358161664 is an equidigital number, since it uses as much as digits as its factorization.

20358161664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26508042 (or 26508028 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 20358161664 in words is "twenty billion, three hundred fifty-eight million, one hundred sixty-one thousand, six hundred sixty-four".