20118631 has 12 divisors (see below), whose sum is σ = 22047256. Its totient is φ = 18249840.

The previous prime is 20118617. The next prime is 20118643. The reversal of 20118631 is 13681102.

It is not a de Polignac number, because 20118631 - 2⁷ = 20118503 is a prime.

It is a super-2 number, since 2×20118631² = 809518626628322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20118661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65380 + ... + 65686.

Almost surely, 2^20118631 is an apocalyptic number.

20118631 is a deficient number, since it is larger than the sum of its proper divisors (1928625).

20118631 is an equidigital number, since it uses as much as digits as its factorization.

20118631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 20118631 is about 4485.3796940727. The cubic root of 20118631 is about 271.9773941348.

Adding to 20118631 its reverse (13681102), we get a palindrome (33799733).

The spelling of 20118631 in words is "twenty million, one hundred eighteen thousand, six hundred thirty-one".