20231885 has 4 divisors (see below), whose sum is σ = 24278268. Its totient is φ = 16185504.

The previous prime is 20231873. The next prime is 20231909. The reversal of 20231885 is 58813202.

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 5470921 + 14760964 = 2339^2 + 3842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20231885 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2023184 + ... + 2023193.

It is an arithmetic number, because the mean of its divisors is an integer number (6069567).

Almost surely, 2^20231885 is an apocalyptic number.

It is an amenable number.

20231885 is a deficient number, since it is larger than the sum of its proper divisors (4046383).

20231885 is an equidigital number, since it uses as much as digits as its factorization.

20231885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4046382.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20231885 is about 4497.9867718792. The cubic root of 20231885 is about 272.4867877891.

The spelling of 20231885 in words is "twenty million, two hundred thirty-one thousand, eight hundred eighty-five".