20197715581056 has 64 divisors (see below), whose sum is σ = 57777119104320. Its totient is φ = 6214681715712.

The previous prime is 20197715581049. The next prime is 20197715581181. The reversal of 20197715581056 is 65018551779102.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 20197715580987 and 20197715581005.

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, 2023003380 + ... + 2023013363.

It is an arithmetic number, because the mean of its divisors is an integer number (902767486005).

Almost surely, 2^{20197715581056} is an apocalyptic number.

20197715581056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20197715581056 is an abundant number, since it is smaller than the sum of its proper divisors (37579403523264).

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

20197715581056 is a wasteful number, since it uses less digits than its factorization.

20197715581056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4046016773 (or 4046016761 counting only the distinct ones).

The product of its (nonzero) digits is 5292000, while the sum is 57.

The spelling of 20197715581056 in words is "twenty trillion, one hundred ninety-seven billion, seven hundred fifteen million, five hundred eighty-one thousand, fifty-six".