20577136028577 has 16 divisors (see below), whose sum is σ = 29552576851968. Its totient is φ = 12698372863440.

The previous prime is 20577136028573. The next prime is 20577136028593. The reversal of 20577136028577 is 77582063177502.

It is not a de Polignac number, because 20577136028577 - 2² = 20577136028573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20577136028577.

It is not an unprimeable number, because it can be changed into a prime (20577136028573) 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, 4809987583 + ... + 4809991860.

It is an arithmetic number, because the mean of its divisors is an integer number (1847036053248).

Almost surely, 2^{20577136028577} is an apocalyptic number.

It is an amenable number.

20577136028577 is a deficient number, since it is larger than the sum of its proper divisors (8975440823391).

20577136028577 is a wasteful number, since it uses less digits than its factorization.

20577136028577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9619979500.

The product of its (nonzero) digits is 34574400, while the sum is 60.

The spelling of 20577136028577 in words is "twenty trillion, five hundred seventy-seven billion, one hundred thirty-six million, twenty-eight thousand, five hundred seventy-seven".