20377056577 has 4 divisors (see below), whose sum is σ = 20386488196. Its totient is φ = 20367624960.

The previous prime is 20377056551. The next prime is 20377056643. The reversal of 20377056577 is 77565077302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10266552976 + 10110503601 = 101324^2 + 100551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20377056577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20377056577.

It is not an unprimeable number, because it can be changed into a prime (20377056877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4712568 + ... + 4716889.

It is an arithmetic number, because the mean of its divisors is an integer number (5096622049).

Almost surely, 2^20377056577 is an apocalyptic number.

It is an amenable number.

20377056577 is a deficient number, since it is larger than the sum of its proper divisors (9431619).

20377056577 is an equidigital number, since it uses as much as digits as its factorization.

20377056577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9431618.

The product of its (nonzero) digits is 2160900, while the sum is 49.

The spelling of 20377056577 in words is "twenty billion, three hundred seventy-seven million, fifty-six thousand, five hundred seventy-seven".