22921660 has 12 divisors (see below), whose sum is σ = 48135528. Its totient is φ = 9168656.

The previous prime is 22921651. The next prime is 22921663. The reversal of 22921660 is 6612922.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22921663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 573022 + ... + 573061.

It is an arithmetic number, because the mean of its divisors is an integer number (4011294).

Almost surely, 2^22921660 is an apocalyptic number.

22921660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22921660 is an abundant number, since it is smaller than the sum of its proper divisors (25213868).

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

22921660 is a wasteful number, since it uses less digits than its factorization.

22921660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146092 (or 1146090 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 22921660 is about 4787.6570470325. The cubic root of 22921660 is about 284.0634487610.

The spelling of 22921660 in words is "twenty-two million, nine hundred twenty-one thousand, six hundred sixty".