22551880 has 64 divisors (see below), whose sum is σ = 56448000. Its totient is φ = 8052480.

The previous prime is 22551863. The next prime is 22551887. The reversal of 22551880 is 8815522.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22551887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15421 + ... + 16819.

It is an arithmetic number, because the mean of its divisors is an integer number (882000).

Almost surely, 2^22551880 is an apocalyptic number.

22551880 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 22551880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28224000).

22551880 is an abundant number, since it is smaller than the sum of its proper divisors (33896120).

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

22551880 is a wasteful number, since it uses less digits than its factorization.

22551880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454 (or 1450 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 22551880 is about 4748.8819736860. The cubic root of 22551880 is about 282.5276241032.

The spelling of 22551880 in words is "twenty-two million, five hundred fifty-one thousand, eight hundred eighty".