22436820 has 72 divisors (see below), whose sum is σ = 77785344. Its totient is φ = 5128128.

The previous prime is 22436819. The next prime is 22436831. The reversal of 22436820 is 2863422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7644 + ... + 10163.

It is an arithmetic number, because the mean of its divisors is an integer number (1080352).

Almost surely, 2^22436820 is an apocalyptic number.

22436820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22436820 is an abundant number, since it is smaller than the sum of its proper divisors (55348524).

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

22436820 is a wasteful number, since it uses less digits than its factorization.

22436820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17829 (or 17824 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 22436820 is about 4736.7520517756. The cubic root of 22436820 is about 282.0463180295.

The spelling of 22436820 in words is "twenty-two million, four hundred thirty-six thousand, eight hundred twenty".