20663123 has 6 divisors (see below), whose sum is σ = 22375044. Its totient is φ = 19073496.

The previous prime is 20663107. The next prime is 20663147. The reversal of 20663123 is 32136602.

It is not a de Polignac number, because 20663123 - 2⁴ = 20663107 is a prime.

It is a super-2 number, since 2×20663123² = 853929304226258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20663173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60965 + ... + 61302.

It is an arithmetic number, because the mean of its divisors is an integer number (3729174).

Almost surely, 2^20663123 is an apocalyptic number.

20663123 is a deficient number, since it is larger than the sum of its proper divisors (1711921).

20663123 is a wasteful number, since it uses less digits than its factorization.

20663123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122293 (or 122280 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20663123 is about 4545.6707975831. The cubic root of 20663123 is about 274.4091911217.

Adding to 20663123 its reverse (32136602), we get a palindrome (52799725).

The spelling of 20663123 in words is "twenty million, six hundred sixty-three thousand, one hundred twenty-three".