20506177643650 has 12 divisors (see below), whose sum is σ = 38141490417282. Its totient is φ = 8202471057440.

The previous prime is 20506177643647. The next prime is 20506177643663. The reversal of 20506177643650 is 5634677160502.

It can be written as a sum of positive squares in 3 ways, for example, as 14274349415881 + 6231828227769 = 3778141^2 + 2496363^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 205061776387 + ... + 205061776486.

Almost surely, 2^{20506177643650} is an apocalyptic number.

20506177643650 is a deficient number, since it is larger than the sum of its proper divisors (17635312773632).

20506177643650 is a wasteful number, since it uses less digits than its factorization.

20506177643650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410123552885 (or 410123552880 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 52.

The spelling of 20506177643650 in words is "twenty trillion, five hundred six billion, one hundred seventy-seven million, six hundred forty-three thousand, six hundred fifty".