20501375 has 8 divisors (see below), whose sum is σ = 25585872. Its totient is φ = 16401000.

The previous prime is 20501363. The next prime is 20501381. The reversal of 20501375 is 57310502.

It is not a de Polignac number, because 20501375 - 2²⁰ = 19452799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20501375.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81881 + ... + 82130.

It is an arithmetic number, because the mean of its divisors is an integer number (3198234).

Almost surely, 2^20501375 is an apocalyptic number.

20501375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20501375 is a deficient number, since it is larger than the sum of its proper divisors (5084497).

20501375 is an equidigital number, since it uses as much as digits as its factorization.

20501375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164026 (or 164016 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20501375 is about 4527.8444098710. The cubic root of 20501375 is about 273.6913025808.

Adding to 20501375 its reverse (57310502), we get a palindrome (77811877).

The spelling of 20501375 in words is "twenty million, five hundred one thousand, three hundred seventy-five".