20520625535613 has 72 divisors (see below), whose sum is σ = 36306341884800. Its totient is φ = 11105433714816.

The previous prime is 20520625535593. The next prime is 20520625535653. The reversal of 20520625535613 is 31653552602502.

It is a happy number.

20520625535613 is a `hidden beast` number, since 2 + 0 + 5 + 2 + 0 + 6 + 25 + 5 + 3 + 5 + 613 = 666.

It is not a de Polignac number, because 20520625535613 - 2⁹ = 20520625535101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520625535653) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 26506620 + ... + 27269802.

It is an arithmetic number, because the mean of its divisors is an integer number (504254748400).

Almost surely, 2^{20520625535613} is an apocalyptic number.

It is an amenable number.

20520625535613 is a deficient number, since it is larger than the sum of its proper divisors (15785716349187).

20520625535613 is a wasteful number, since it uses less digits than its factorization.

20520625535613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766431 (or 766421 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 45.

The spelling of 20520625535613 in words is "twenty trillion, five hundred twenty billion, six hundred twenty-five million, five hundred thirty-five thousand, six hundred thirteen".