20663406 has 24 divisors (see below), whose sum is σ = 45171360. Its totient is φ = 6826176.

The previous prime is 20663371. The next prime is 20663413. The reversal of 20663406 is 60436602.

20663406 is a `hidden beast` number, since 20 + 6 + 634 + 0 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20663406.

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, 3046 + ... + 7113.

It is an arithmetic number, because the mean of its divisors is an integer number (1882140).

Almost surely, 2^20663406 is an apocalyptic number.

20663406 is an abundant number, since it is smaller than the sum of its proper divisors (24507954).

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

20663406 is a wasteful number, since it uses less digits than its factorization.

20663406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10280 (or 10277 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 20663406 is about 4545.7019259956. The cubic root of 20663406 is about 274.4104438760.

The spelling of 20663406 in words is "twenty million, six hundred sixty-three thousand, four hundred six".