20423690393 has 2 divisors, whose sum is σ = 20423690394. Its totient is φ = 20423690392.

The previous prime is 20423690317. The next prime is 20423690407. The reversal of 20423690393 is 39309632402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13002384784 + 7421305609 = 114028^2 + 86147^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423690393 - 2¹⁰ = 20423689369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20423690393.

It is not a weakly prime, because it can be changed into another prime (20423690093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211845196 + 10211845197.

It is an arithmetic number, because the mean of its divisors is an integer number (10211845197).

Almost surely, 2^20423690393 is an apocalyptic number.

It is an amenable number.

20423690393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423690393 is an equidigital number, since it uses as much as digits as its factorization.

20423690393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 41.

The spelling of 20423690393 in words is "twenty billion, four hundred twenty-three million, six hundred ninety thousand, three hundred ninety-three".