20513174157 has 64 divisors (see below), whose sum is σ = 36065088000. Its totient is φ = 11274729984.

The previous prime is 20513174141. The next prime is 20513174159. The reversal of 20513174157 is 75147131502.

20513174157 is a `hidden beast` number, since 20 + 513 + 1 + 74 + 1 + 57 = 666.

It is not a de Polignac number, because 20513174157 - 2⁴ = 20513174141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513174159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1467433 + ... + 1481345.

It is an arithmetic number, because the mean of its divisors is an integer number (563517000).

Almost surely, 2^20513174157 is an apocalyptic number.

20513174157 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20513174157 is a deficient number, since it is larger than the sum of its proper divisors (15551913843).

20513174157 is a wasteful number, since it uses less digits than its factorization.

20513174157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14227 (or 14221 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The spelling of 20513174157 in words is "twenty billion, five hundred thirteen million, one hundred seventy-four thousand, one hundred fifty-seven".