20886660 has 60 divisors (see below), whose sum is σ = 65527308. Its totient is φ = 5569344.

The previous prime is 20886637. The next prime is 20886661. The reversal of 20886660 is 6668802.

It can be written as a sum of positive squares in 2 ways, for example, as 10036224 + 10850436 = 3168^2 + 3294^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20886661) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4827 + ... + 8066.

Almost surely, 2^20886660 is an apocalyptic number.

20886660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20886660 is an abundant number, since it is smaller than the sum of its proper divisors (44640648).

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

20886660 is a wasteful number, since it uses less digits than its factorization.

20886660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12914 (or 12903 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20886660 is about 4570.1925561184. The cubic root of 20886660 is about 275.3951784082.

It can be divided in two parts, 208 and 86660, that added together give a palindrome (86868).

The spelling of 20886660 in words is "twenty million, eight hundred eighty-six thousand, six hundred sixty".