20516252151231 has 24 divisors (see below), whose sum is σ = 31447166175360. Its totient is φ = 12861084612816.

The previous prime is 20516252151223. The next prime is 20516252151247. The reversal of 20516252151231 is 13215125261502.

20516252151231 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 6 + 2 + 521 + 5 + 123 + 1 = 666.

It is not a de Polignac number, because 20516252151231 - 2³ = 20516252151223 is a prime.

It is a super-2 number, since 2×20516252151231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516252151281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 839922781 + ... + 839947206.

It is an arithmetic number, because the mean of its divisors is an integer number (1310298590640).

Almost surely, 2^{20516252151231} is an apocalyptic number.

20516252151231 is a deficient number, since it is larger than the sum of its proper divisors (10930914024129).

20516252151231 is a wasteful number, since it uses less digits than its factorization.

20516252151231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679870075 (or 1679870072 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 20516252151231 in words is "twenty trillion, five hundred sixteen billion, two hundred fifty-two million, one hundred fifty-one thousand, two hundred thirty-one".