20565035655 has 64 divisors (see below), whose sum is σ = 34737196032. Its totient is φ = 10368849920.

The previous prime is 20565035549. The next prime is 20565035707. The reversal of 20565035655 is 55653056502.

It is not a de Polignac number, because 20565035655 - 2¹⁸ = 20564773511 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13241359 + ... + 13242911.

It is an arithmetic number, because the mean of its divisors is an integer number (542768688).

Almost surely, 2^20565035655 is an apocalyptic number.

20565035655 is a deficient number, since it is larger than the sum of its proper divisors (14172160377).

20565035655 is a wasteful number, since it uses less digits than its factorization.

20565035655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008.

The product of its (nonzero) digits is 675000, while the sum is 42.

The spelling of 20565035655 in words is "twenty billion, five hundred sixty-five million, thirty-five thousand, six hundred fifty-five".