22551620 has 48 divisors (see below), whose sum is σ = 58291968. Its totient is φ = 7136640.

The previous prime is 22551619. The next prime is 22551631. The reversal of 22551620 is 2615522.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4376 + ... + 8015.

It is an arithmetic number, because the mean of its divisors is an integer number (1214416).

Almost surely, 2^22551620 is an apocalyptic number.

22551620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22551620 is an abundant number, since it is smaller than the sum of its proper divisors (35740348).

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

22551620 is a wasteful number, since it uses less digits than its factorization.

22551620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12420 (or 12418 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 22551620 is about 4748.8545987427. The cubic root of 22551620 is about 282.5265383480.

The spelling of 22551620 in words is "twenty-two million, five hundred fifty-one thousand, six hundred twenty".