22857820 has 12 divisors (see below), whose sum is σ = 48001464. Its totient is φ = 9143120.

The previous prime is 22857803. The next prime is 22857851. The reversal of 22857820 is 2875822.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 571426 + ... + 571465.

It is an arithmetic number, because the mean of its divisors is an integer number (4000122).

Almost surely, 2^22857820 is an apocalyptic number.

22857820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22857820 is an abundant number, since it is smaller than the sum of its proper divisors (25143644).

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

22857820 is a wasteful number, since it uses less digits than its factorization.

22857820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142900 (or 1142898 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 22857820 is about 4780.9852541082. The cubic root of 22857820 is about 283.7994848586.

The spelling of 22857820 in words is "twenty-two million, eight hundred fifty-seven thousand, eight hundred twenty".