20297760 has 144 divisors (see below), whose sum is σ = 74462976. Its totient is φ = 4634112.

The previous prime is 20297759. The next prime is 20297789. The reversal of 20297760 is 6779202.

It is a super-2 number, since 2×20297760² = 823998122035200, which contains 22 as substring.

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, 23089 + ... + 23951.

It is an arithmetic number, because the mean of its divisors is an integer number (517104).

Almost surely, 2^20297760 is an apocalyptic number.

20297760 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 20297760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37231488).

20297760 is an abundant number, since it is smaller than the sum of its proper divisors (54165216).

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

20297760 is a wasteful number, since it uses less digits than its factorization.

20297760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 20297760 is about 4505.3035413832. The cubic root of 20297760 is about 272.7822063081.

The spelling of 20297760 in words is "twenty million, two hundred ninety-seven thousand, seven hundred sixty".