20955979284520 has 64 divisors (see below), whose sum is σ = 53887569419520. Its totient is φ = 7184805110784.

The previous prime is 20955979284517. The next prime is 20955979284533. The reversal of 20955979284520 is 2548297955902.

It is a super-2 number, since 2×20955979284520² (a number of 27 digits) contains 22 as substring.

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, 20728309 + ... + 21715771.

It is an arithmetic number, because the mean of its divisors is an integer number (841993272180).

Almost surely, 2^{20955979284520} is an apocalyptic number.

20955979284520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20955979284520 is an abundant number, since it is smaller than the sum of its proper divisors (32931590135000).

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

20955979284520 is a wasteful number, since it uses less digits than its factorization.

20955979284520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063274 (or 1063270 counting only the distinct ones).

The product of its (nonzero) digits is 163296000, while the sum is 67.

The spelling of 20955979284520 in words is "twenty trillion, nine hundred fifty-five billion, nine hundred seventy-nine million, two hundred eighty-four thousand, five hundred twenty".