20413514869981 has 2 divisors, whose sum is σ = 20413514869982. Its totient is φ = 20413514869980.

The previous prime is 20413514869961. The next prime is 20413514869997. The reversal of 20413514869981 is 18996841531402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20332352557881 + 81162312100 = 4509141^2 + 284890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20413514869981 is a prime.

It is a super-2 number, since 2×20413514869981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20413514869901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206757434990 + 10206757434991.

It is an arithmetic number, because the mean of its divisors is an integer number (10206757434991).

Almost surely, 2^{20413514869981} is an apocalyptic number.

It is an amenable number.

20413514869981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20413514869981 is an equidigital number, since it uses as much as digits as its factorization.

20413514869981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 20413514869981 in words is "twenty trillion, four hundred thirteen billion, five hundred fourteen million, eight hundred sixty-nine thousand, nine hundred eighty-one".