20312513216664 has 32 divisors (see below), whose sum is σ = 50871480736320. Its totient is φ = 6758811379616.

The previous prime is 20312513216561. The next prime is 20312513216689. The reversal of 20312513216664 is 46661231521302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751633662 + ... + 751660685.

It is an arithmetic number, because the mean of its divisors is an integer number (1589733773010).

Almost surely, 2^{20312513216664} is an apocalyptic number.

20312513216664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20312513216664 is an abundant number, since it is smaller than the sum of its proper divisors (30558967519656).

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

20312513216664 is a wasteful number, since it uses less digits than its factorization.

20312513216664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503294919 (or 1503294915 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

Adding to 20312513216664 its reverse (46661231521302), we get a palindrome (66973744737966).

The spelling of 20312513216664 in words is "twenty trillion, three hundred twelve billion, five hundred thirteen million, two hundred sixteen thousand, six hundred sixty-four".