20531657711518 has 32 divisors (see below), whose sum is σ = 32459404456512. Its totient is φ = 9720853824000.

The previous prime is 20531657711503. The next prime is 20531657711533. The reversal of 20531657711518 is 81511775613502.

It is an interprime number because it is at equal distance from previous prime (20531657711503) and next prime (20531657711533).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32023380 + ... + 32658232.

It is an arithmetic number, because the mean of its divisors is an integer number (1014356389266).

Almost surely, 2^{20531657711518} is an apocalyptic number.

20531657711518 is a deficient number, since it is larger than the sum of its proper divisors (11927746744994).

20531657711518 is a wasteful number, since it uses less digits than its factorization.

20531657711518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641940.

The product of its (nonzero) digits is 1764000, while the sum is 52.

The spelling of 20531657711518 in words is "twenty trillion, five hundred thirty-one billion, six hundred fifty-seven million, seven hundred eleven thousand, five hundred eighteen".