20663793 has 12 divisors (see below), whose sum is σ = 30226560. Its totient is φ = 13601016.

The previous prime is 20663791. The next prime is 20663801. The reversal of 20663793 is 39736602.

It is not a de Polignac number, because 20663793 - 2¹ = 20663791 is a prime.

It is a super-2 number, since 2×20663793² = 853984682293698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20663791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13821 + ... + 15242.

It is an arithmetic number, because the mean of its divisors is an integer number (2518880).

Almost surely, 2^20663793 is an apocalyptic number.

It is an amenable number.

20663793 is a deficient number, since it is larger than the sum of its proper divisors (9562767).

20663793 is a wasteful number, since it uses less digits than its factorization.

20663793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29148 (or 29145 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 36.

The square root of 20663793 is about 4545.7444934796. The cubic root of 20663793 is about 274.4121569879.

The spelling of 20663793 in words is "twenty million, six hundred sixty-three thousand, seven hundred ninety-three".