22791820 has 24 divisors (see below), whose sum is σ = 49408128. Its totient is φ = 8822400.

The previous prime is 22791803. The next prime is 22791823. The reversal of 22791820 is 2819722.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (22791823) 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 7 ways as a sum of consecutive naturals, for example, 17761 + ... + 19000.

It is an arithmetic number, because the mean of its divisors is an integer number (2058672).

Almost surely, 2^22791820 is an apocalyptic number.

22791820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22791820 is an abundant number, since it is smaller than the sum of its proper divisors (26616308).

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

22791820 is a wasteful number, since it uses less digits than its factorization.

22791820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36801 (or 36799 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 22791820 is about 4774.0779214420. The cubic root of 22791820 is about 283.5260726259.

The spelling of 22791820 in words is "twenty-two million, seven hundred ninety-one thousand, eight hundred twenty".