20400534626631 has 16 divisors (see below), whose sum is σ = 27841027558656. Its totient is φ = 13283816654016.

The previous prime is 20400534626621. The next prime is 20400534626639. The reversal of 20400534626631 is 13662643500402.

It is a happy number.

It is not a de Polignac number, because 20400534626631 - 2⁶ = 20400534626567 is a prime.

It is a super-2 number, since 2×20400534626631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400534626639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452177085 + ... + 452222198.

It is an arithmetic number, because the mean of its divisors is an integer number (1740064222416).

Almost surely, 2^{20400534626631} is an apocalyptic number.

20400534626631 is a deficient number, since it is larger than the sum of its proper divisors (7440492932025).

20400534626631 is a wasteful number, since it uses less digits than its factorization.

20400534626631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904399462.

The product of its (nonzero) digits is 622080, while the sum is 42.

The spelling of 20400534626631 in words is "twenty trillion, four hundred billion, five hundred thirty-four million, six hundred twenty-six thousand, six hundred thirty-one".