22157980 has 24 divisors (see below), whose sum is σ = 50111712. Its totient is φ = 8181312.

The previous prime is 22157959. The next prime is 22158007. The reversal of 22157980 is 8975122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42352 + ... + 42871.

It is an arithmetic number, because the mean of its divisors is an integer number (2087988).

Almost surely, 2^22157980 is an apocalyptic number.

22157980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22157980 is an abundant number, since it is smaller than the sum of its proper divisors (27953732).

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

22157980 is a wasteful number, since it uses less digits than its factorization.

22157980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85245 (or 85243 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 22157980 is about 4707.2263595455. The cubic root of 22157980 is about 280.8730403361.

The spelling of 22157980 in words is "twenty-two million, one hundred fifty-seven thousand, nine hundred eighty".