22087980 has 72 divisors (see below), whose sum is σ = 67393872. Its totient is φ = 5855616.

The previous prime is 22087969. The next prime is 22087999. The reversal of 22087980 is 8978022.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49639 + ... + 50081.

It is an arithmetic number, because the mean of its divisors is an integer number (936026).

Almost surely, 2^22087980 is an apocalyptic number.

22087980 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 22087980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33696936).

22087980 is an abundant number, since it is smaller than the sum of its proper divisors (45305892).

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

22087980 is a wasteful number, since it uses less digits than its factorization.

22087980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 22087980 is about 4699.7851014701. The cubic root of 22087980 is about 280.5769565887.

The spelling of 22087980 in words is "twenty-two million, eighty-seven thousand, nine hundred eighty".