20663744 has 14 divisors (see below), whose sum is σ = 41004744. Its totient is φ = 10331840.

The previous prime is 20663737. The next prime is 20663759. The reversal of 20663744 is 44736602.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 20663744.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161372 + ... + 161499.

Almost surely, 2^20663744 is an apocalyptic number.

It is an amenable number.

20663744 is a deficient number, since it is larger than the sum of its proper divisors (20341000).

20663744 is an equidigital number, since it uses as much as digits as its factorization.

20663744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322883 (or 322873 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 20663744 is about 4545.7391038202. The cubic root of 20663744 is about 274.4119400834.

The spelling of 20663744 in words is "twenty million, six hundred sixty-three thousand, seven hundred forty-four".