22506631 has 8 divisors (see below), whose sum is σ = 26247200. Its totient is φ = 19291104.

The previous prime is 22506629. The next prime is 22506637. The reversal of 22506631 is 13660522.

It is not a de Polignac number, because 22506631 - 2¹ = 22506629 is a prime.

It is a super-2 number, since 2×22506631² = 1013096877940322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22506596 and 22506605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22506637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32466 + ... + 33151.

It is an arithmetic number, because the mean of its divisors is an integer number (3280900).

Almost surely, 2^22506631 is an apocalyptic number.

22506631 is a deficient number, since it is larger than the sum of its proper divisors (3740569).

22506631 is an frugal number, since it uses more digits than its factorization.

22506631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65638 (or 65624 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 22506631 is about 4744.1154075338. The cubic root of 22506631 is about 282.3385393177.

The spelling of 22506631 in words is "twenty-two million, five hundred six thousand, six hundred thirty-one".