20457291264 has 40 divisors (see below), whose sum is σ = 54499506600. Its totient is φ = 6819096576.

The previous prime is 20457291247. The next prime is 20457291271. The reversal of 20457291264 is 46219275402.

It is a happy number.

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, 6657739 + ... + 6660810.

It is an arithmetic number, because the mean of its divisors is an integer number (1362487665).

Almost surely, 2^20457291264 is an apocalyptic number.

20457291264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20457291264 is an abundant number, since it is smaller than the sum of its proper divisors (34042215336).

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

20457291264 is an equidigital number, since it uses as much as digits as its factorization.

20457291264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13318570 (or 13318554 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 20457291264 in words is "twenty billion, four hundred fifty-seven million, two hundred ninety-one thousand, two hundred sixty-four".