22720940 has 48 divisors (see below), whose sum is σ = 52496640. Its totient is φ = 8191680.

The previous prime is 22720939. The next prime is 22720961. The reversal of 22720940 is 4902722.

It is a super-2 number, since 2×22720940² = 1032482228967200, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 30209 + ... + 30951.

It is an arithmetic number, because the mean of its divisors is an integer number (1093680).

Almost surely, 2^22720940 is an apocalyptic number.

22720940 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 22720940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26248320).

22720940 is an abundant number, since it is smaller than the sum of its proper divisors (29775700).

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

22720940 is a wasteful number, since it uses less digits than its factorization.

22720940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902 (or 900 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 22720940 is about 4766.6487179149. The cubic root of 22720940 is about 283.2318560088.

The spelling of 22720940 in words is "twenty-two million, seven hundred twenty thousand, nine hundred forty".