22405980 has 96 divisors (see below), whose sum is σ = 66124800. Its totient is φ = 5660928.

The previous prime is 22405973. The next prime is 22405991. The reversal of 22405980 is 8950422.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137379 + ... + 137541.

It is an arithmetic number, because the mean of its divisors is an integer number (688800).

Almost surely, 2^22405980 is an apocalyptic number.

22405980 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 22405980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33062400).

22405980 is an abundant number, since it is smaller than the sum of its proper divisors (43718820).

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

22405980 is a wasteful number, since it uses less digits than its factorization.

22405980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 22405980 is about 4733.4955371269. The cubic root of 22405980 is about 281.9170320783.

The spelling of 22405980 in words is "twenty-two million, four hundred five thousand, nine hundred eighty".