20666012 has 12 divisors (see below), whose sum is σ = 36285480. Its totient is φ = 10298736.

The previous prime is 20666003. The next prime is 20666021. The reversal of 20666012 is 21066602.

It is an interprime number because it is at equal distance from previous prime (20666003) and next prime (20666021).

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, 7187 + ... + 9642.

It is an arithmetic number, because the mean of its divisors is an integer number (3023790).

Almost surely, 2^20666012 is an apocalyptic number.

It is an amenable number.

20666012 is a deficient number, since it is larger than the sum of its proper divisors (15619468).

20666012 is a wasteful number, since it uses less digits than its factorization.

20666012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17140 (or 17138 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20666012 is about 4545.9885613582. The cubic root of 20666012 is about 274.4219793017.

The spelling of 20666012 in words is "twenty million, six hundred sixty-six thousand, twelve".