20230531 has 4 divisors (see below), whose sum is σ = 20239632. Its totient is φ = 20221432.

The previous prime is 20230519. The next prime is 20230537. The reversal of 20230531 is 13503202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20230531 - 2⁵ = 20230499 is a prime.

It is a super-2 number, since 2×20230531² = 818548769083922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20230537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1245 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (5059908).

Almost surely, 2^20230531 is an apocalyptic number.

20230531 is a deficient number, since it is larger than the sum of its proper divisors (9101).

20230531 is an equidigital number, since it uses as much as digits as its factorization.

20230531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9100.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20230531 is about 4497.8362575799. The cubic root of 20230531 is about 272.4807090123.

Adding to 20230531 its reverse (13503202), we get a palindrome (33733733).

The spelling of 20230531 in words is "twenty million, two hundred thirty thousand, five hundred thirty-one".