20648660 has 12 divisors (see below), whose sum is σ = 43362228. Its totient is φ = 8259456.

The previous prime is 20648647. The next prime is 20648699. The reversal of 20648660 is 6684602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10523536 + 10125124 = 3244^2 + 3182^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 516197 + ... + 516236.

It is an arithmetic number, because the mean of its divisors is an integer number (3613519).

Almost surely, 2^20648660 is an apocalyptic number.

20648660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20648660 is an abundant number, since it is smaller than the sum of its proper divisors (22713568).

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

20648660 is a wasteful number, since it uses less digits than its factorization.

20648660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032442 (or 1032440 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 20648660 is about 4544.0796647946. The cubic root of 20648660 is about 274.3451526176.

The spelling of 20648660 in words is "twenty million, six hundred forty-eight thousand, six hundred sixty".