20456515457 has 8 divisors (see below), whose sum is σ = 23610349632. Its totient is φ = 17360550000.

The previous prime is 20456515451. The next prime is 20456515529. The reversal of 20456515457 is 75451565402.

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 20456515457 - 2¹⁴ = 20456499073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20456515451) 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, 14466419 + ... + 14467832.

It is an arithmetic number, because the mean of its divisors is an integer number (2951293704).

Almost surely, 2^20456515457 is an apocalyptic number.

It is an amenable number.

20456515457 is a deficient number, since it is larger than the sum of its proper divisors (3153834175).

20456515457 is a wasteful number, since it uses less digits than its factorization.

20456515457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28934359.

The product of its (nonzero) digits is 840000, while the sum is 44.

It can be divided in two parts, 204565 and 15457, that added together give a palindrome (220022).

The spelling of 20456515457 in words is "twenty billion, four hundred fifty-six million, five hundred fifteen thousand, four hundred fifty-seven".