20181875 has 30 divisors (see below), whose sum is σ = 29381220. Its totient is φ = 13818000.

The previous prime is 20181859. The next prime is 20181937. The reversal of 20181875 is 57818102.

It is a happy number.

It is not a de Polignac number, because 20181875 - 2⁴ = 20181859 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 30296 + ... + 30954.

It is an arithmetic number, because the mean of its divisors is an integer number (979374).

Almost surely, 2^20181875 is an apocalyptic number.

20181875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20181875 is a deficient number, since it is larger than the sum of its proper divisors (9199345).

20181875 is an frugal number, since it uses more digits than its factorization.

20181875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 20181875 is about 4492.4241785477. The cubic root of 20181875 is about 272.2620878880.

Adding to 20181875 its reverse (57818102), we get a palindrome (77999977).

The spelling of 20181875 in words is "twenty million, one hundred eighty-one thousand, eight hundred seventy-five".