22401620 has 12 divisors (see below), whose sum is σ = 47043444. Its totient is φ = 8960640.

The previous prime is 22401619. The next prime is 22401647. The reversal of 22401620 is 2610422.

It can be written as a sum of positive squares in 2 ways, for example, as 16418704 + 5982916 = 4052^2 + 2446^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560021 + ... + 560060.

It is an arithmetic number, because the mean of its divisors is an integer number (3920287).

Almost surely, 2^22401620 is an apocalyptic number.

22401620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22401620 is an abundant number, since it is smaller than the sum of its proper divisors (24641824).

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

22401620 is a wasteful number, since it uses less digits than its factorization.

22401620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120090 (or 1120088 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 22401620 is about 4733.0349671220. The cubic root of 22401620 is about 281.8987447283.

The spelling of 22401620 in words is "twenty-two million, four hundred one thousand, six hundred twenty".