20356740497 has 2 divisors, whose sum is σ = 20356740498. Its totient is φ = 20356740496.

The previous prime is 20356740451. The next prime is 20356740541. The reversal of 20356740497 is 79404765302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15622750081 + 4733990416 = 124991^2 + 68804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20356740497 is a prime.

It is not a weakly prime, because it can be changed into another prime (20356740407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178370248 + 10178370249.

It is an arithmetic number, because the mean of its divisors is an integer number (10178370249).

Almost surely, 2^20356740497 is an apocalyptic number.

It is an amenable number.

20356740497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356740497 is an equidigital number, since it uses as much as digits as its factorization.

20356740497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 47.

The spelling of 20356740497 in words is "twenty billion, three hundred fifty-six million, seven hundred forty thousand, four hundred ninety-seven".