20077657 has 4 divisors (see below), whose sum is σ = 20770020. Its totient is φ = 19385296.

The previous prime is 20077639. The next prime is 20077693. The reversal of 20077657 is 75677002.

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 12809241 + 7268416 = 3579^2 + 2696^2 .

It is a cyclic number.

It is not a de Polignac number, because 20077657 - 2²³ = 11689049 is a prime.

It is a super-2 number, since 2×20077657² = 806224621219298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20077627) 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, 346138 + ... + 346195.

It is an arithmetic number, because the mean of its divisors is an integer number (5192505).

Almost surely, 2^20077657 is an apocalyptic number.

It is an amenable number.

20077657 is a deficient number, since it is larger than the sum of its proper divisors (692363).

20077657 is an equidigital number, since it uses as much as digits as its factorization.

20077657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692362.

The product of its (nonzero) digits is 20580, while the sum is 34.

The square root of 20077657 is about 4480.8098598356. The cubic root of 20077657 is about 271.7926304750.

The spelling of 20077657 in words is "twenty million, seventy-seven thousand, six hundred fifty-seven".