20917752207456 has 96 divisors (see below), whose sum is σ = 60248591272800. Its totient is φ = 6314793099264.

The previous prime is 20917752207421. The next prime is 20917752207481. The reversal of 20917752207456 is 65470225771902.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20917752207396 and 20917752207405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158056681 + ... + 158188968.

It is an arithmetic number, because the mean of its divisors is an integer number (627589492425).

Almost surely, 2^{20917752207456} is an apocalyptic number.

20917752207456 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20917752207456 is an abundant number, since it is smaller than the sum of its proper divisors (39330839065344).

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

20917752207456 is a wasteful number, since it uses less digits than its factorization.

20917752207456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316245728 (or 316245720 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 57.

The spelling of 20917752207456 in words is "twenty trillion, nine hundred seventeen billion, seven hundred fifty-two million, two hundred seven thousand, four hundred fifty-six".