20506702177 has 12 divisors (see below), whose sum is σ = 22624463484. Its totient is φ = 18572099520.

The previous prime is 20506702159. The next prime is 20506702201. The reversal of 20506702177 is 77120760502.

It can be written as a sum of positive squares in 6 ways, for example, as 165096801 + 20341605376 = 12849^2 + 142624^2 .

It is not a de Polignac number, because 20506702177 - 2²³ = 20498313569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20506702577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1135774 + ... + 1153687.

It is an arithmetic number, because the mean of its divisors is an integer number (1885371957).

Almost surely, 2^20506702177 is an apocalyptic number.

It is an amenable number.

20506702177 is a deficient number, since it is larger than the sum of its proper divisors (2117761307).

20506702177 is a wasteful number, since it uses less digits than its factorization.

20506702177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289540 (or 2289527 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 37.

The spelling of 20506702177 in words is "twenty billion, five hundred six million, seven hundred two thousand, one hundred seventy-seven".