20846660 has 12 divisors (see below), whose sum is σ = 43778028. Its totient is φ = 8338656.

The previous prime is 20846659. The next prime is 20846677. The reversal of 20846660 is 6664802.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11062276 + 9784384 = 3326^2 + 3128^2 .

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, 521147 + ... + 521186.

It is an arithmetic number, because the mean of its divisors is an integer number (3648169).

Almost surely, 2^20846660 is an apocalyptic number.

20846660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20846660 is an abundant number, since it is smaller than the sum of its proper divisors (22931368).

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

20846660 is a wasteful number, since it uses less digits than its factorization.

20846660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042342 (or 1042340 counting only the distinct ones).

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

The square root of 20846660 is about 4565.8142756796. The cubic root of 20846660 is about 275.2192631471.

The spelling of 20846660 in words is "twenty million, eight hundred forty-six thousand, six hundred sixty".