20660480 has 36 divisors (see below), whose sum is σ = 49491372. Its totient is φ = 8263680.

The previous prime is 20660473. The next prime is 20660483. The reversal of 20660480 is 8406602.

It can be written as a sum of positive squares in 2 ways, for example, as 7929856 + 12730624 = 2816^2 + 3568^2 .

It is not an unprimeable number, because it can be changed into a prime (20660483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6791 + ... + 9350.

Almost surely, 2^20660480 is an apocalyptic number.

20660480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20660480 is an abundant number, since it is smaller than the sum of its proper divisors (28830892).

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

20660480 is an equidigital number, since it uses as much as digits as its factorization.

20660480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16162 (or 16148 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20660480 is about 4545.3800721172. The cubic root of 20660480 is about 274.3974908185.

The spelling of 20660480 in words is "twenty million, six hundred sixty thousand, four hundred eighty".