22631540 has 24 divisors (see below), whose sum is σ = 49593600. Its totient is φ = 8658848.

The previous prime is 22631509. The next prime is 22631551. The reversal of 22631540 is 4513622.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24140 + ... + 25059.

It is an arithmetic number, because the mean of its divisors is an integer number (2066400).

Almost surely, 2^22631540 is an apocalyptic number.

22631540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22631540 is an abundant number, since it is smaller than the sum of its proper divisors (26962060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22631540 is a wasteful number, since it uses less digits than its factorization.

22631540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49231 (or 49229 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 22631540 is about 4757.2618174744. The cubic root of 22631540 is about 282.8598906064.

The spelling of 22631540 in words is "twenty-two million, six hundred thirty-one thousand, five hundred forty".