20344140256631 has 4 divisors (see below), whose sum is σ = 21540854389392. Its totient is φ = 19147426123872.

The previous prime is 20344140256621. The next prime is 20344140256639. The reversal of 20344140256631 is 13665204144302.

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

It is a cyclic number.

It is not a de Polignac number, because 20344140256631 - 2²⁶ = 20344073147767 is a prime.

It is a super-2 number, since 2×20344140256631² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344140256639) 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, 598357066355 + ... + 598357066388.

It is an arithmetic number, because the mean of its divisors is an integer number (5385213597348).

Almost surely, 2^{20344140256631} is an apocalyptic number.

20344140256631 is a deficient number, since it is larger than the sum of its proper divisors (1196714132761).

20344140256631 is a wasteful number, since it uses less digits than its factorization.

20344140256631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196714132760.

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 20344140256631 in words is "twenty trillion, three hundred forty-four billion, one hundred forty million, two hundred fifty-six thousand, six hundred thirty-one".