22505780 has 24 divisors (see below), whose sum is σ = 51559200. Its totient is φ = 8183840.

The previous prime is 22505771. The next prime is 22505789. The reversal of 22505780 is 8750522.

It is an interprime number because it is at equal distance from previous prime (22505771) and next prime (22505789).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22505789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50930 + ... + 51369.

It is an arithmetic number, because the mean of its divisors is an integer number (2148300).

Almost surely, 2^22505780 is an apocalyptic number.

22505780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22505780 is an abundant number, since it is smaller than the sum of its proper divisors (29053420).

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

22505780 is a wasteful number, since it uses less digits than its factorization.

22505780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102319 (or 102317 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 22505780 is about 4744.0257166251. The cubic root of 22505780 is about 282.3349807646.

The spelling of 22505780 in words is "twenty-two million, five hundred five thousand, seven hundred eighty".