20404402049 has 2 divisors, whose sum is σ = 20404402050. Its totient is φ = 20404402048.

The previous prime is 20404402009. The next prime is 20404402127. The reversal of 20404402049 is 94020440402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19731259024 + 673143025 = 140468^2 + 25945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20404402049 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404402009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202201024 + 10202201025.

It is an arithmetic number, because the mean of its divisors is an integer number (10202201025).

Almost surely, 2^20404402049 is an apocalyptic number.

It is an amenable number.

20404402049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404402049 is an equidigital number, since it uses as much as digits as its factorization.

20404402049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 29.

The spelling of 20404402049 in words is "twenty billion, four hundred four million, four hundred two thousand, forty-nine".