20513235654 has 24 divisors (see below), whose sum is σ = 44636105592. Its totient is φ = 6808397280.

The previous prime is 20513235641. The next prime is 20513235671. The reversal of 20513235654 is 45653231502.

20513235654 is a `hidden beast` number, since 20 + 51 + 3 + 23 + 565 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2441352 + ... + 2449739.

It is an arithmetic number, because the mean of its divisors is an integer number (1859837733).

Almost surely, 2^20513235654 is an apocalyptic number.

20513235654 is an abundant number, since it is smaller than the sum of its proper divisors (24122869938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20513235654 is a wasteful number, since it uses less digits than its factorization.

20513235654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4891332 (or 4891329 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The spelling of 20513235654 in words is "twenty billion, five hundred thirteen million, two hundred thirty-five thousand, six hundred fifty-four".