20403102409 has 2 divisors, whose sum is σ = 20403102410. Its totient is φ = 20403102408.

The previous prime is 20403102397. The next prime is 20403102427. The reversal of 20403102409 is 90420130402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17168336784 + 3234765625 = 131028^2 + 56875^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403102409 - 2¹⁹ = 20402578121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20403102469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201551204 + 10201551205.

It is an arithmetic number, because the mean of its divisors is an integer number (10201551205).

Almost surely, 2^20403102409 is an apocalyptic number.

It is an amenable number.

20403102409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403102409 is an equidigital number, since it uses as much as digits as its factorization.

20403102409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 20403102409 in words is "twenty billion, four hundred three million, one hundred two thousand, four hundred nine".