20664126 has 32 divisors (see below), whose sum is σ = 52481280. Its totient is φ = 5903928.

The previous prime is 20664113. The next prime is 20664131. The reversal of 20664126 is 62146602.

It is a happy number.

It is a super-2 number, since 2×20664126² = 854012206687752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20664126.

It is a congruent number.

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, 26956 + ... + 27711.

It is an arithmetic number, because the mean of its divisors is an integer number (1640040).

Almost surely, 2^20664126 is an apocalyptic number.

20664126 is an abundant number, since it is smaller than the sum of its proper divisors (31817154).

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

20664126 is a wasteful number, since it uses less digits than its factorization.

20664126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54685 (or 54679 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20664126 is about 4545.7811209956. The cubic root of 20664126 is about 274.4136310438.

The spelling of 20664126 in words is "twenty million, six hundred sixty-four thousand, one hundred twenty-six".