20413515604649 has 2 divisors, whose sum is σ = 20413515604650. Its totient is φ = 20413515604648.

The previous prime is 20413515604619. The next prime is 20413515604709. The reversal of 20413515604649 is 94640651531402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18814383378025 + 1599132226624 = 4337555^2 + 1264568^2 .

It is a cyclic number.

It is not a de Polignac number, because 20413515604649 - 2²⁸ = 20413247169193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20413515604597 and 20413515604606.

It is not a weakly prime, because it can be changed into another prime (20413515604619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206757802324 + 10206757802325.

It is an arithmetic number, because the mean of its divisors is an integer number (10206757802325).

Almost surely, 2^{20413515604649} is an apocalyptic number.

It is an amenable number.

20413515604649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20413515604649 is an equidigital number, since it uses as much as digits as its factorization.

20413515604649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 20413515604649 in words is "twenty trillion, four hundred thirteen billion, five hundred fifteen million, six hundred four thousand, six hundred forty-nine".