22405780 has 12 divisors (see below), whose sum is σ = 47052180. Its totient is φ = 8962304.

The previous prime is 22405771. The next prime is 22405783. The reversal of 22405780 is 8750422.

It can be written as a sum of positive squares in 2 ways, for example, as 4866436 + 17539344 = 2206^2 + 4188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22405783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560125 + ... + 560164.

It is an arithmetic number, because the mean of its divisors is an integer number (3921015).

Almost surely, 2^22405780 is an apocalyptic number.

22405780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22405780 is an abundant number, since it is smaller than the sum of its proper divisors (24646400).

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

22405780 is a wasteful number, since it uses less digits than its factorization.

22405780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120298 (or 1120296 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 22405780 is about 4733.4744110431. The cubic root of 22405780 is about 281.9161932609.

The spelling of 22405780 in words is "twenty-two million, four hundred five thousand, seven hundred eighty".