20131375 has 24 divisors (see below), whose sum is σ = 27636336. Its totient is φ = 14641000.

The previous prime is 20131373. The next prime is 20131379. The reversal of 20131375 is 57313102.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 20131375 - 2¹ = 20131373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131373) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1830120 + ... + 1830130.

It is an arithmetic number, because the mean of its divisors is an integer number (1151514).

Almost surely, 2^20131375 is an apocalyptic number.

20131375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20131375 is a deficient number, since it is larger than the sum of its proper divisors (7504961).

20131375 is an frugal number, since it uses more digits than its factorization.

20131375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 16 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 20131375 is about 4486.8000846929. The cubic root of 20131375 is about 272.0348093787.

Adding to 20131375 its reverse (57313102), we get a palindrome (77444477).

The spelling of 20131375 in words is "twenty million, one hundred thirty-one thousand, three hundred seventy-five".