20375129 has 4 divisors (see below), whose sum is σ = 21573684. Its totient is φ = 19176576.

The previous prime is 20375101. The next prime is 20375167. The reversal of 20375129 is 92157302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9909904 + 10465225 = 3148^2 + 3235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20375129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20375189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 599252 + ... + 599285.

It is an arithmetic number, because the mean of its divisors is an integer number (5393421).

Almost surely, 2^20375129 is an apocalyptic number.

It is an amenable number.

20375129 is a deficient number, since it is larger than the sum of its proper divisors (1198555).

20375129 is a wasteful number, since it uses less digits than its factorization.

20375129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198554.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20375129 is about 4513.8818105927. The cubic root of 20375129 is about 273.1283549798.

The spelling of 20375129 in words is "twenty million, three hundred seventy-five thousand, one hundred twenty-nine".