20664198 has 24 divisors (see below), whose sum is σ = 45279000. Its totient is φ = 6810144.

The previous prime is 20664139. The next prime is 20664239. The reversal of 20664198 is 89146602.

20664198 is a `hidden beast` number, since 2 + 0 + 6 + 641 + 9 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4848 + ... + 8051.

It is an arithmetic number, because the mean of its divisors is an integer number (1886625).

Almost surely, 2^20664198 is an apocalyptic number.

20664198 is an abundant number, since it is smaller than the sum of its proper divisors (24614802).

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

20664198 is a wasteful number, since it uses less digits than its factorization.

20664198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12996 (or 12993 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20664198 is about 4545.7890404197. The cubic root of 20664198 is about 274.4139497565.

The spelling of 20664198 in words is "twenty million, six hundred sixty-four thousand, one hundred ninety-eight".