20976742886413 has 2 divisors, whose sum is σ = 20976742886414. Its totient is φ = 20976742886412.

The previous prime is 20976742886311. The next prime is 20976742886419. The reversal of 20976742886413 is 31468824767902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12835610313124 + 8141132573289 = 3582682^2 + 2853267^2 .

It is a cyclic number.

It is not a de Polignac number, because 20976742886413 - 2¹⁷ = 20976742755341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20976742886419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10488371443206 + 10488371443207.

It is an arithmetic number, because the mean of its divisors is an integer number (10488371443207).

Almost surely, 2^{20976742886413} is an apocalyptic number.

It is an amenable number.

20976742886413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20976742886413 is an equidigital number, since it uses as much as digits as its factorization.

20976742886413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 195084288, while the sum is 67.

The spelling of 20976742886413 in words is "twenty trillion, nine hundred seventy-six billion, seven hundred forty-two million, eight hundred eighty-six thousand, four hundred thirteen".