22257820 has 24 divisors (see below), whose sum is σ = 50337504. Its totient is φ = 8218176.

The previous prime is 22257779. The next prime is 22257881. The reversal of 22257820 is 2875222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42544 + ... + 43063.

It is an arithmetic number, because the mean of its divisors is an integer number (2097396).

Almost surely, 2^22257820 is an apocalyptic number.

22257820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22257820 is an abundant number, since it is smaller than the sum of its proper divisors (28079684).

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

22257820 is a wasteful number, since it uses less digits than its factorization.

22257820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85629 (or 85627 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 22257820 is about 4717.8194115502. The cubic root of 22257820 is about 281.2942633215.

The spelling of 22257820 in words is "twenty-two million, two hundred fifty-seven thousand, eight hundred twenty".