20649112631457 has 8 divisors (see below), whose sum is σ = 27532360371840. Its totient is φ = 13765969989360.

The previous prime is 20649112631447. The next prime is 20649112631503. The reversal of 20649112631457 is 75413621194602.

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

It is not a de Polignac number, because 20649112631457 - 2²⁰ = 20649111582881 is a prime.

It is a super-2 number, since 2×20649112631457² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20649112631437) 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, 25814982 + ... + 26602847.

It is an arithmetic number, because the mean of its divisors is an integer number (3441545046480).

Almost surely, 2^{20649112631457} is an apocalyptic number.

It is an amenable number.

20649112631457 is a deficient number, since it is larger than the sum of its proper divisors (6883247740383).

20649112631457 is a wasteful number, since it uses less digits than its factorization.

20649112631457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52549143.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 20649112631457 in words is "twenty trillion, six hundred forty-nine billion, one hundred twelve million, six hundred thirty-one thousand, four hundred fifty-seven".