20066664 has 64 divisors (see below), whose sum is σ = 53654400. Its totient is φ = 6232064.

The previous prime is 20066639. The next prime is 20066687. The reversal of 20066664 is 46666002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55717 + ... + 56075.

It is an arithmetic number, because the mean of its divisors is an integer number (838350).

Almost surely, 2^20066664 is an apocalyptic number.

20066664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20066664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26827200).

20066664 is an abundant number, since it is smaller than the sum of its proper divisors (33587736).

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

20066664 is a wasteful number, since it uses less digits than its factorization.

20066664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 20066664 is about 4479.5830163085. The cubic root of 20066664 is about 271.7430170855.

The spelling of 20066664 in words is "twenty million, sixty-six thousand, six hundred sixty-four".