22551940 has 24 divisors (see below), whose sum is σ = 47460672. Its totient is φ = 9001440.

The previous prime is 22551931. The next prime is 22551941. The reversal of 22551940 is 4915522.

It is a junction number, because it is equal to n+sod(n) for n = 22551899 and 22551908.

It is not an unprimeable number, because it can be changed into a prime (22551941) 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, 11727 + ... + 13513.

It is an arithmetic number, because the mean of its divisors is an integer number (1977528).

Almost surely, 2^22551940 is an apocalyptic number.

22551940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22551940 is an abundant number, since it is smaller than the sum of its proper divisors (24908732).

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

22551940 is a wasteful number, since it uses less digits than its factorization.

22551940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427 (or 2425 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 22551940 is about 4748.8882909582. Note that the first 3 decimals coincide. The cubic root of 22551940 is about 282.5278746609.

The spelling of 22551940 in words is "twenty-two million, five hundred fifty-one thousand, nine hundred forty".