20654358813 has 24 divisors (see below), whose sum is σ = 32614283520. Its totient is φ = 12491631360.

The previous prime is 20654358797. The next prime is 20654358833. The reversal of 20654358813 is 31885345602.

20654358813 is a `hidden beast` number, since 2 + 0 + 6 + 54 + 3 + 588 + 13 = 666.

It is not a de Polignac number, because 20654358813 - 2⁴ = 20654358797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20654358833) 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, 170356 + ... + 265197.

It is an arithmetic number, because the mean of its divisors is an integer number (1358928480).

Almost surely, 2^20654358813 is an apocalyptic number.

It is an amenable number.

20654358813 is a deficient number, since it is larger than the sum of its proper divisors (11959924707).

20654358813 is a wasteful number, since it uses less digits than its factorization.

20654358813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436049 (or 436046 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

It can be divided in two parts, 206543 and 58813, that added together give a triangular number (265356 = T₇₂₈).

The spelling of 20654358813 in words is "twenty billion, six hundred fifty-four million, three hundred fifty-eight thousand, eight hundred thirteen".