20494579873 has 2 divisors, whose sum is σ = 20494579874. Its totient is φ = 20494579872.

The previous prime is 20494579813. The next prime is 20494579907. The reversal of 20494579873 is 37897549402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17947157089 + 2547422784 = 133967^2 + 50472^2 .

It is a cyclic number.

It is not a de Polignac number, because 20494579873 - 2³³ = 11904645281 is a prime.

It is a super-2 number, since 2×20494579873² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20494579813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247289936 + 10247289937.

It is an arithmetic number, because the mean of its divisors is an integer number (10247289937).

Almost surely, 2^20494579873 is an apocalyptic number.

It is an amenable number.

20494579873 is a deficient number, since it is larger than the sum of its proper divisors (1).

20494579873 is an equidigital number, since it uses as much as digits as its factorization.

20494579873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 58.

The spelling of 20494579873 in words is "twenty billion, four hundred ninety-four million, five hundred seventy-nine thousand, eight hundred seventy-three".