20268684817 has 2 divisors, whose sum is σ = 20268684818. Its totient is φ = 20268684816.

The previous prime is 20268684773. The next prime is 20268684857. The reversal of 20268684817 is 71848686202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20242460176 + 26224641 = 142276^2 + 5121^2 .

It is a cyclic number.

It is not a de Polignac number, because 20268684817 - 2¹⁵ = 20268652049 is a prime.

It is a super-3 number, since 3×20268684817³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20268684857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10134342408 + 10134342409.

It is an arithmetic number, because the mean of its divisors is an integer number (10134342409).

Almost surely, 2^20268684817 is an apocalyptic number.

It is an amenable number.

20268684817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20268684817 is an equidigital number, since it uses as much as digits as its factorization.

20268684817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2064384, while the sum is 52.

The spelling of 20268684817 in words is "twenty billion, two hundred sixty-eight million, six hundred eighty-four thousand, eight hundred seventeen".