20455295657 has 8 divisors (see below), whose sum is σ = 21152271360. Its totient is φ = 19760640480.

The previous prime is 20455295639. The next prime is 20455295659. The reversal of 20455295657 is 75659255402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20455295657 - 2⁸ = 20455295401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20455295659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 562193 + ... + 597470.

It is an arithmetic number, because the mean of its divisors is an integer number (2644033920).

Almost surely, 2^20455295657 is an apocalyptic number.

It is an amenable number.

20455295657 is a deficient number, since it is larger than the sum of its proper divisors (696975703).

20455295657 is a wasteful number, since it uses less digits than its factorization.

20455295657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160263.

The product of its (nonzero) digits is 3780000, while the sum is 50.

The spelling of 20455295657 in words is "twenty billion, four hundred fifty-five million, two hundred ninety-five thousand, six hundred fifty-seven".