20390523435983 has 2 divisors, whose sum is σ = 20390523435984. Its totient is φ = 20390523435982.

The previous prime is 20390523435967. The next prime is 20390523436009. The reversal of 20390523435983 is 38953432509302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20390523435983 - 2⁴ = 20390523435967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20390523435683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10195261717991 + 10195261717992.

It is an arithmetic number, because the mean of its divisors is an integer number (10195261717992).

Almost surely, 2^{20390523435983} is an apocalyptic number.

20390523435983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20390523435983 is an equidigital number, since it uses as much as digits as its factorization.

20390523435983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20995200, while the sum is 56.

The spelling of 20390523435983 in words is "twenty trillion, three hundred ninety billion, five hundred twenty-three million, four hundred thirty-five thousand, nine hundred eighty-three".