22387820 has 48 divisors (see below), whose sum is σ = 57868608. Its totient is φ = 7084800.

The previous prime is 22387819. The next prime is 22387823. The reversal of 22387820 is 2878322.

It is not an unprimeable number, because it can be changed into a prime (22387823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4331 + ... + 7970.

It is an arithmetic number, because the mean of its divisors is an integer number (1205596).

Almost surely, 2^22387820 is an apocalyptic number.

22387820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22387820 is an abundant number, since it is smaller than the sum of its proper divisors (35480788).

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

22387820 is a wasteful number, since it uses less digits than its factorization.

22387820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12330 (or 12328 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 22387820 is about 4731.5769041621. The cubic root of 22387820 is about 281.8408471034.

The spelling of 22387820 in words is "twenty-two million, three hundred eighty-seven thousand, eight hundred twenty".