20163975 has 24 divisors (see below), whose sum is σ = 35903952. Its totient is φ = 9926400.

The previous prime is 20163931. The next prime is 20163991. The reversal of 20163975 is 57936102.

It is not a de Polignac number, because 20163975 - 2⁶ = 20163911 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9366 + ... + 11315.

It is an arithmetic number, because the mean of its divisors is an integer number (1495998).

Almost surely, 2^20163975 is an apocalyptic number.

20163975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20163975 is a deficient number, since it is larger than the sum of its proper divisors (15739977).

20163975 is a wasteful number, since it uses less digits than its factorization.

20163975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20707 (or 20702 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 20163975 is about 4490.4314937431. The cubic root of 20163975 is about 272.1815712048.

The spelling of 20163975 in words is "twenty million, one hundred sixty-three thousand, nine hundred seventy-five".