20663408 has 20 divisors (see below), whose sum is σ = 40354560. Its totient is φ = 10249344.

The previous prime is 20663371. The next prime is 20663413. The reversal of 20663408 is 80436602.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

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, 3053 + ... + 7116.

It is an arithmetic number, because the mean of its divisors is an integer number (2017728).

Almost surely, 2^20663408 is an apocalyptic number.

It is an amenable number.

20663408 is a deficient number, since it is larger than the sum of its proper divisors (19691152).

20663408 is a wasteful number, since it uses less digits than its factorization.

20663408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10304 (or 10298 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20663408 is about 4545.7021459836. The cubic root of 20663408 is about 274.4104527293.

The spelling of 20663408 in words is "twenty million, six hundred sixty-three thousand, four hundred eight".