22381820 has 12 divisors (see below), whose sum is σ = 47001864. Its totient is φ = 8952720.

The previous prime is 22381817. The next prime is 22381831. The reversal of 22381820 is 2818322.

It is a self number, because there is not a number n which added to its sum of digits gives 22381820.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 559526 + ... + 559565.

It is an arithmetic number, because the mean of its divisors is an integer number (3916822).

Almost surely, 2^22381820 is an apocalyptic number.

22381820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22381820 is an abundant number, since it is smaller than the sum of its proper divisors (24620044).

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

22381820 is a wasteful number, since it uses less digits than its factorization.

22381820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119100 (or 1119098 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 22381820 is about 4730.9428235818. The cubic root of 22381820 is about 281.8156668019.

The spelling of 22381820 in words is "twenty-two million, three hundred eighty-one thousand, eight hundred twenty".