20415499969 has 2 divisors, whose sum is σ = 20415499970. Its totient is φ = 20415499968.

The previous prime is 20415499931. The next prime is 20415499987. The reversal of 20415499969 is 96999451402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17061584400 + 3353915569 = 130620^2 + 57913^2 .

It is a cyclic number.

It is not a de Polignac number, because 20415499969 - 2⁹ = 20415499457 is a prime.

It is a super-2 number, since 2×20415499969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20415499669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10207749984 + 10207749985.

It is an arithmetic number, because the mean of its divisors is an integer number (10207749985).

Almost surely, 2^20415499969 is an apocalyptic number.

It is an amenable number.

20415499969 is a deficient number, since it is larger than the sum of its proper divisors (1).

20415499969 is an equidigital number, since it uses as much as digits as its factorization.

20415499969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6298560, while the sum is 58.

The spelling of 20415499969 in words is "twenty billion, four hundred fifteen million, four hundred ninety-nine thousand, nine hundred sixty-nine".