22851720 has 96 divisors (see below), whose sum is σ = 77051520. Its totient is φ = 6091200.

The previous prime is 22851713. The next prime is 22851721. The reversal of 22851720 is 2715822.

It is a super-2 number, since 2×22851720² = 1044402213916800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22851721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8545 + ... + 10895.

It is an arithmetic number, because the mean of its divisors is an integer number (802620).

Almost surely, 2^22851720 is an apocalyptic number.

22851720 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 22851720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38525760).

22851720 is an abundant number, since it is smaller than the sum of its proper divisors (54199800).

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

22851720 is a wasteful number, since it uses less digits than its factorization.

22851720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377 (or 2361 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 22851720 is about 4780.3472677202. The cubic root of 22851720 is about 283.7742370313.

It can be divided in two parts, 2285 and 1720, that added together give a triangular number (4005 = T₈₉).

The spelling of 22851720 in words is "twenty-two million, eight hundred fifty-one thousand, seven hundred twenty".