20562381017 has 2 divisors, whose sum is σ = 20562381018. Its totient is φ = 20562381016.

The previous prime is 20562380989. The next prime is 20562381029. The reversal of 20562381017 is 71018326502.

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., 20493640336 + 68740681 = 143156^2 + 8291^2 .

It is a cyclic number.

It is not a de Polignac number, because 20562381017 - 2¹⁴ = 20562364633 is a prime.

It is not a weakly prime, because it can be changed into another prime (20562081017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10281190508 + 10281190509.

It is an arithmetic number, because the mean of its divisors is an integer number (10281190509).

Almost surely, 2^20562381017 is an apocalyptic number.

It is an amenable number.

20562381017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20562381017 is an equidigital number, since it uses as much as digits as its factorization.

20562381017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 20562381017 in words is "twenty billion, five hundred sixty-two million, three hundred eighty-one thousand, seventeen".