20040344309 has 2 divisors, whose sum is σ = 20040344310. Its totient is φ = 20040344308.

The previous prime is 20040344287. The next prime is 20040344329. The reversal of 20040344309 is 90344304002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10392783025 + 9647561284 = 101945^2 + 98222^2 .

It is a cyclic number.

It is not a de Polignac number, because 20040344309 - 2¹² = 20040340213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20040344329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10020172154 + 10020172155.

It is an arithmetic number, because the mean of its divisors is an integer number (10020172155).

Almost surely, 2^20040344309 is an apocalyptic number.

It is an amenable number.

20040344309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20040344309 is an equidigital number, since it uses as much as digits as its factorization.

20040344309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 29.

The spelling of 20040344309 in words is "twenty billion, forty million, three hundred forty-four thousand, three hundred nine".