20231605 has 12 divisors (see below), whose sum is σ = 25382700. Its totient is φ = 15479552.

The previous prime is 20231597. The next prime is 20231639. The reversal of 20231605 is 50613202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3470769 + 16760836 = 1863^2 + 4094^2 .

It is not a de Polignac number, because 20231605 - 2³ = 20231597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1180 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (2115225).

Almost surely, 2^20231605 is an apocalyptic number.

It is an amenable number.

20231605 is a deficient number, since it is larger than the sum of its proper divisors (5151095).

20231605 is an equidigital number, since it uses as much as digits as its factorization.

20231605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7700 (or 7677 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20231605 is about 4497.9556467355. The cubic root of 20231605 is about 272.4855307526.

Adding to 20231605 its reverse (50613202), we get a palindrome (70844807).

The spelling of 20231605 in words is "twenty million, two hundred thirty-one thousand, six hundred five".