22145920 has 32 divisors (see below), whose sum is σ = 52944120. Its totient is φ = 8858112.

The previous prime is 22145911. The next prime is 22145923. The reversal of 22145920 is 2954122.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22145923) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16662 + ... + 17941.

Almost surely, 2^22145920 is an apocalyptic number.

22145920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22145920 is an abundant number, since it is smaller than the sum of its proper divisors (30798200).

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

22145920 is an equidigital number, since it uses as much as digits as its factorization.

22145920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34622 (or 34610 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 22145920 is about 4705.9451760512. The cubic root of 22145920 is about 280.8220738431.

The spelling of 22145920 in words is "twenty-two million, one hundred forty-five thousand, nine hundred twenty".