20237131631 has 4 divisors (see below), whose sum is σ = 20445761952. Its totient is φ = 20028501312.

The previous prime is 20237131627. The next prime is 20237131637. The reversal of 20237131631 is 13613173202.

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 20237131631 - 2² = 20237131627 is a prime.

It is a super-2 number, since 2×20237131631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20237131594 and 20237131603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20237131637) 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, 104315015 + ... + 104315208.

It is an arithmetic number, because the mean of its divisors is an integer number (5111440488).

Almost surely, 2^20237131631 is an apocalyptic number.

20237131631 is a deficient number, since it is larger than the sum of its proper divisors (208630321).

20237131631 is an equidigital number, since it uses as much as digits as its factorization.

20237131631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208630320.

The product of its (nonzero) digits is 4536, while the sum is 29.

The spelling of 20237131631 in words is "twenty billion, two hundred thirty-seven million, one hundred thirty-one thousand, six hundred thirty-one".