20231539 has 2 divisors, whose sum is σ = 20231540. Its totient is φ = 20231538.

The previous prime is 20231527. The next prime is 20231551. The reversal of 20231539 is 93513202.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20231527) and next prime (20231551).

It is a cyclic number.

It is not a de Polignac number, because 20231539 - 2⁵ = 20231507 is a prime.

It is not a weakly prime, because it can be changed into another prime (20231579) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10115769 + 10115770.

It is an arithmetic number, because the mean of its divisors is an integer number (10115770).

Almost surely, 2^20231539 is an apocalyptic number.

20231539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20231539 is an equidigital number, since it uses as much as digits as its factorization.

20231539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 20231539 is about 4497.9483100632. The cubic root of 20231539 is about 272.4852344495.

The spelling of 20231539 in words is "twenty million, two hundred thirty-one thousand, five hundred thirty-nine".