20315531457 has 32 divisors (see below), whose sum is σ = 32480179200. Its totient is φ = 12475662336.

The previous prime is 20315531381. The next prime is 20315531459. The reversal of 20315531457 is 75413551302.

20315531457 is a `hidden beast` number, since 20 + 3 + 155 + 31 + 457 = 666.

It is not a de Polignac number, because 20315531457 - 2¹⁹ = 20315007169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20315531459) 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 31 ways as a sum of consecutive naturals, for example, 107713 + ... + 228545.

It is an arithmetic number, because the mean of its divisors is an integer number (1015005600).

Almost surely, 2^20315531457 is an apocalyptic number.

20315531457 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20315531457 is a deficient number, since it is larger than the sum of its proper divisors (12164647743).

20315531457 is a wasteful number, since it uses less digits than its factorization.

20315531457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121334 (or 121328 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The spelling of 20315531457 in words is "twenty billion, three hundred fifteen million, five hundred thirty-one thousand, four hundred fifty-seven".