20604660 has 24 divisors (see below), whose sum is σ = 57693216. Its totient is φ = 5494560.

The previous prime is 20604613. The next prime is 20604679. The reversal of 20604660 is 6640602.

It is a self number, because there is not a number n which added to its sum of digits gives 20604660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171646 + ... + 171765.

It is an arithmetic number, because the mean of its divisors is an integer number (2403884).

Almost surely, 2^20604660 is an apocalyptic number.

20604660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20604660 is an abundant number, since it is smaller than the sum of its proper divisors (37088556).

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

20604660 is a wasteful number, since it uses less digits than its factorization.

20604660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343423 (or 343421 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20604660 is about 4539.2356184715. The cubic root of 20604660 is about 274.1501476956.

The spelling of 20604660 in words is "twenty million, six hundred four thousand, six hundred sixty".