20502198617 has 2 divisors, whose sum is σ = 20502198618. Its totient is φ = 20502198616.

The previous prime is 20502198593. The next prime is 20502198751. The reversal of 20502198617 is 71689120502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20012063296 + 490135321 = 141464^2 + 22139^2 .

It is a cyclic number.

It is not a de Polignac number, because 20502198617 - 2⁶ = 20502198553 is a prime.

It is a super-3 number, since 3×20502198617³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20502198217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251099308 + 10251099309.

It is an arithmetic number, because the mean of its divisors is an integer number (10251099309).

Almost surely, 2^20502198617 is an apocalyptic number.

It is an amenable number.

20502198617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20502198617 is an equidigital number, since it uses as much as digits as its factorization.

20502198617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 20502198617 in words is "twenty billion, five hundred two million, one hundred ninety-eight thousand, six hundred seventeen".