20741506417 has 2 divisors, whose sum is σ = 20741506418. Its totient is φ = 20741506416.

The previous prime is 20741506391. The next prime is 20741506481. The reversal of 20741506417 is 71460514702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15504234256 + 5237272161 = 124516^2 + 72369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20741506417 is a prime.

It is not a weakly prime, because it can be changed into another prime (20741506117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370753208 + 10370753209.

It is an arithmetic number, because the mean of its divisors is an integer number (10370753209).

Almost surely, 2^20741506417 is an apocalyptic number.

It is an amenable number.

20741506417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20741506417 is an equidigital number, since it uses as much as digits as its factorization.

20741506417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 20741506417 in words is "twenty billion, seven hundred forty-one million, five hundred six thousand, four hundred seventeen".