220400631 has 24 divisors (see below), whose sum is σ = 367730064. Its totient is φ = 125717760.

The previous prime is 220400629. The next prime is 220400701. The reversal of 220400631 is 136004022.

It is a happy number.

It is not a de Polignac number, because 220400631 - 2¹ = 220400629 is a prime.

It is a super-2 number, since 2×220400631² = 97152876290396322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220400611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63796 + ... + 67161.

It is an arithmetic number, because the mean of its divisors is an integer number (15322086).

Almost surely, 2^220400631 is an apocalyptic number.

220400631 is a deficient number, since it is larger than the sum of its proper divisors (147329433).

220400631 is a wasteful number, since it uses less digits than its factorization.

220400631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130991 (or 130988 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 220400631 is about 14845.8960995960. The cubic root of 220400631 is about 604.0472959397.

Adding to 220400631 its reverse (136004022), we get a palindrome (356404653).

The spelling of 220400631 in words is "two hundred twenty million, four hundred thousand, six hundred thirty-one".