20718880 has 96 divisors (see below), whose sum is σ = 60286464. Its totient is φ = 6552576.

The previous prime is 20718871. The next prime is 20718913. The reversal of 20718880 is 8881702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13849 + ... + 15271.

It is an arithmetic number, because the mean of its divisors is an integer number (627984).

Almost surely, 2^20718880 is an apocalyptic number.

20718880 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 20718880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30143232).

20718880 is an abundant number, since it is smaller than the sum of its proper divisors (39567584).

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

20718880 is a wasteful number, since it uses less digits than its factorization.

20718880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458 (or 1450 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 20718880 is about 4551.7996440968. The cubic root of 20718880 is about 274.6557897265.

The spelling of 20718880 in words is "twenty million, seven hundred eighteen thousand, eight hundred eighty".