20531023 has 2 divisors, whose sum is σ = 20531024. Its totient is φ = 20531022.

The previous prime is 20530987. The next prime is 20531059. The reversal of 20531023 is 32013502.

It is a balanced prime because it is at equal distance from previous prime (20530987) and next prime (20531059).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20531023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20530988 and 20531006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20501023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265511 + 10265512.

It is an arithmetic number, because the mean of its divisors is an integer number (10265512).

Almost surely, 2^20531023 is an apocalyptic number.

20531023 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531023 is an equidigital number, since it uses as much as digits as its factorization.

20531023 is an evil number, because the sum of its binary digits is even.

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

The square root of 20531023 is about 4531.1171911572. The cubic root of 20531023 is about 273.8231716439.

Adding to 20531023 its reverse (32013502), we get a palindrome (52544525).

The spelling of 20531023 in words is "twenty million, five hundred thirty-one thousand, twenty-three".