20961564912264 has 32 divisors (see below), whose sum is σ = 52415150800320. Its totient is φ = 6985689834816.

The previous prime is 20961564912221. The next prime is 20961564912287. The reversal of 20961564912264 is 46221946516902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93540087 + ... + 93763910.

It is an arithmetic number, because the mean of its divisors is an integer number (1637973462510).

Almost surely, 2^{20961564912264} is an apocalyptic number.

20961564912264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20961564912264 is an abundant number, since it is smaller than the sum of its proper divisors (31453585888056).

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

20961564912264 is a wasteful number, since it uses less digits than its factorization.

20961564912264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187308669 (or 187308665 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 57.

The spelling of 20961564912264 in words is "twenty trillion, nine hundred sixty-one billion, five hundred sixty-four million, nine hundred twelve thousand, two hundred sixty-four".