20790560 has 96 divisors (see below), whose sum is σ = 59149440. Its totient is φ = 6746112.

The previous prime is 20790557. The next prime is 20790563. The reversal of 20790560 is 6509702.

It is an interprime number because it is at equal distance from previous prime (20790557) and next prime (20790563).

It is a super-2 number, since 2×20790560² = 864494770227200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20790563) 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, 20792 + ... + 21768.

It is an arithmetic number, because the mean of its divisors is an integer number (616140).

Almost surely, 2^20790560 is an apocalyptic number.

20790560 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 20790560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29574720).

20790560 is an abundant number, since it is smaller than the sum of its proper divisors (38358880).

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

20790560 is a wasteful number, since it uses less digits than its factorization.

20790560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018 (or 1010 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20790560 is about 4559.6666544825. Note that the first 4 decimals coincide. The cubic root of 20790560 is about 274.9721624714.

The spelling of 20790560 in words is "twenty million, seven hundred ninety thousand, five hundred sixty".