20507273301561 has 16 divisors (see below), whose sum is σ = 28125695539200. Its totient is φ = 13284368671248.

The previous prime is 20507273301551. The next prime is 20507273301563. The reversal of 20507273301561 is 16510337270502.

It is not a de Polignac number, because 20507273301561 - 2⁷ = 20507273301433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20507273301563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 523151821 + ... + 523191018.

It is an arithmetic number, because the mean of its divisors is an integer number (1757855971200).

Almost surely, 2^{20507273301561} is an apocalyptic number.

It is an amenable number.

20507273301561 is a deficient number, since it is larger than the sum of its proper divisors (7618422237639).

20507273301561 is a wasteful number, since it uses less digits than its factorization.

20507273301561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046343028.

The product of its (nonzero) digits is 264600, while the sum is 42.

The spelling of 20507273301561 in words is "twenty trillion, five hundred seven billion, two hundred seventy-three million, three hundred one thousand, five hundred sixty-one".