20368643136 has 56 divisors (see below), whose sum is σ = 53902502304. Its totient is φ = 6788229120.

The previous prime is 20368643129. The next prime is 20368643149. The reversal of 20368643136 is 63134686302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1932216 + ... + 1942728.

It is an arithmetic number, because the mean of its divisors is an integer number (962544684).

Almost surely, 2^20368643136 is an apocalyptic number.

It is an amenable number.

20368643136 is an abundant number, since it is smaller than the sum of its proper divisors (33533859168).

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

20368643136 is a wasteful number, since it uses less digits than its factorization.

20368643136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20619 (or 20609 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 42.

The spelling of 20368643136 in words is "twenty billion, three hundred sixty-eight million, six hundred forty-three thousand, one hundred thirty-six".