20423817793 has 2 divisors, whose sum is σ = 20423817794. Its totient is φ = 20423817792.

The previous prime is 20423817769. The next prime is 20423817797. The reversal of 20423817793 is 39771832402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19362165904 + 1061651889 = 139148^2 + 32583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20423817793 is a prime.

It is not a weakly prime, because it can be changed into another prime (20423817797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211908896 + 10211908897.

It is an arithmetic number, because the mean of its divisors is an integer number (10211908897).

Almost surely, 2^20423817793 is an apocalyptic number.

It is an amenable number.

20423817793 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423817793 is an equidigital number, since it uses as much as digits as its factorization.

20423817793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 20423817793 in words is "twenty billion, four hundred twenty-three million, eight hundred seventeen thousand, seven hundred ninety-three".