20750804617 has 2 divisors, whose sum is σ = 20750804618. Its totient is φ = 20750804616.

The previous prime is 20750804579. The next prime is 20750804621. The reversal of 20750804617 is 71640805702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16060746361 + 4690058256 = 126731^2 + 68484^2 .

It is a cyclic number.

It is not a de Polignac number, because 20750804617 - 2¹⁹ = 20750280329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20750804617.

It is not a weakly prime, because it can be changed into another prime (20750804317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10375402308 + 10375402309.

It is an arithmetic number, because the mean of its divisors is an integer number (10375402309).

Almost surely, 2^20750804617 is an apocalyptic number.

It is an amenable number.

20750804617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20750804617 is an equidigital number, since it uses as much as digits as its factorization.

20750804617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 20750804617 in words is "twenty billion, seven hundred fifty million, eight hundred four thousand, six hundred seventeen".