22851840 has 144 divisors (see below), whose sum is σ = 79765056. Its totient is φ = 5529600.

The previous prime is 22851839. The next prime is 22851853. The reversal of 22851840 is 4815822.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 22851798 and 22851807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41970 + ... + 42510.

It is an arithmetic number, because the mean of its divisors is an integer number (553924).

Almost surely, 2^22851840 is an apocalyptic number.

22851840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22851840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39882528).

22851840 is an abundant number, since it is smaller than the sum of its proper divisors (56913216).

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

22851840 is a wasteful number, since it uses less digits than its factorization.

22851840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 22851840 is about 4780.3598190931. The cubic root of 22851840 is about 283.7747337532.

The spelling of 22851840 in words is "twenty-two million, eight hundred fifty-one thousand, eight hundred forty".