20722880 has 56 divisors (see below), whose sum is σ = 50962560. Its totient is φ = 8017920.

The previous prime is 20722873. The next prime is 20722909. The reversal of 20722880 is 8822702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8876 + ... + 10964.

Almost surely, 2^20722880 is an apocalyptic number.

20722880 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 20722880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25481280).

20722880 is an abundant number, since it is smaller than the sum of its proper divisors (30239680).

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

20722880 is a wasteful number, since it uses less digits than its factorization.

20722880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137 (or 2127 counting only the distinct ones).

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

The square root of 20722880 is about 4552.2390095424. The cubic root of 20722880 is about 274.6734636623.

The spelling of 20722880 in words is "twenty million, seven hundred twenty-two thousand, eight hundred eighty".