20138075 has 6 divisors (see below), whose sum is σ = 24971244. Its totient is φ = 16110440.

The previous prime is 20138071. The next prime is 20138089. The reversal of 20138075 is 57083102.

It is not a de Polignac number, because 20138075 - 2² = 20138071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20138071) 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, 402737 + ... + 402786.

It is an arithmetic number, because the mean of its divisors is an integer number (4161874).

Almost surely, 2^20138075 is an apocalyptic number.

20138075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20138075 is a deficient number, since it is larger than the sum of its proper divisors (4833169).

20138075 is an equidigital number, since it uses as much as digits as its factorization.

20138075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805533 (or 805528 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20138075 is about 4487.5466571391. The cubic root of 20138075 is about 272.0649850135.

The spelling of 20138075 in words is "twenty million, one hundred thirty-eight thousand, seventy-five".