20638075 has 12 divisors (see below), whose sum is σ = 25684120. Its totient is φ = 16450560.

The previous prime is 20638043. The next prime is 20638081. The reversal of 20638075 is 57083602.

It is not a de Polignac number, because 20638075 - 2⁵ = 20638043 is a prime.

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, 6331 + ... + 9019.

Almost surely, 2^20638075 is an apocalyptic number.

20638075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20638075 is a deficient number, since it is larger than the sum of its proper divisors (5046045).

20638075 is a wasteful number, since it uses less digits than its factorization.

20638075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3006 (or 3001 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20638075 is about 4542.9148132009. The cubic root of 20638075 is about 274.2982659626.

The spelling of 20638075 in words is "twenty million, six hundred thirty-eight thousand, seventy-five".