20577255772557 has 16 divisors (see below), whose sum is σ = 31231882280448. Its totient is φ = 11928843925680.

The previous prime is 20577255772523. The next prime is 20577255772583. The reversal of 20577255772557 is 75527755277502.

It is not a de Polignac number, because 20577255772557 - 2⁷ = 20577255772429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20577255777557) 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, 13555503703 + ... + 13555505220.

It is an arithmetic number, because the mean of its divisors is an integer number (1951992642528).

Almost surely, 2^{20577255772557} is an apocalyptic number.

It is an amenable number.

20577255772557 is a deficient number, since it is larger than the sum of its proper divisors (10654626507891).

20577255772557 is a wasteful number, since it uses less digits than its factorization.

20577255772557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27111008960.

The product of its (nonzero) digits is 420175000, while the sum is 66.

The spelling of 20577255772557 in words is "twenty trillion, five hundred seventy-seven billion, two hundred fifty-five million, seven hundred seventy-two thousand, five hundred fifty-seven".