20748520 has 32 divisors (see below), whose sum is σ = 50276520. Its totient is φ = 7660800.

The previous prime is 20748509. The next prime is 20748523. The reversal of 20748520 is 2584702.

It can be written as a sum of positive squares in 4 ways, for example, as 7043716 + 13704804 = 2654^2 + 3702^2 .

It is not an unprimeable number, because it can be changed into a prime (20748523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19431 + ... + 20470.

Almost surely, 2^20748520 is an apocalyptic number.

20748520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20748520 is an abundant number, since it is smaller than the sum of its proper divisors (29528000).

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

20748520 is a wasteful number, since it uses less digits than its factorization.

20748520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39925 (or 39921 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 20748520 is about 4555.0543355705. The cubic root of 20748520 is about 274.7866996127.

The spelling of 20748520 in words is "twenty million, seven hundred forty-eight thousand, five hundred twenty".