22720880 has 80 divisors (see below), whose sum is σ = 65037504. Its totient is φ = 7188480.

The previous prime is 22720843. The next prime is 22720889. The reversal of 22720880 is 8802722.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22720889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5720 + ... + 8840.

Almost surely, 2^22720880 is an apocalyptic number.

22720880 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 22720880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32518752).

22720880 is an abundant number, since it is smaller than the sum of its proper divisors (42316624).

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

22720880 is a wasteful number, since it uses less digits than its factorization.

22720880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154 (or 3148 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 22720880 is about 4766.6424241808. The cubic root of 22720880 is about 283.2316066951.

The spelling of 22720880 in words is "twenty-two million, seven hundred twenty thousand, eight hundred eighty".