20122705409 has 2 divisors, whose sum is σ = 20122705410. Its totient is φ = 20122705408.

The previous prime is 20122705321. The next prime is 20122705433. The reversal of 20122705409 is 90450722102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19704298384 + 418407025 = 140372^2 + 20455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20122705409 is a prime.

It is not a weakly prime, because it can be changed into another prime (20122705909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061352704 + 10061352705.

It is an arithmetic number, because the mean of its divisors is an integer number (10061352705).

Almost surely, 2^20122705409 is an apocalyptic number.

It is an amenable number.

20122705409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122705409 is an equidigital number, since it uses as much as digits as its factorization.

20122705409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 20122705409 in words is "twenty billion, one hundred twenty-two million, seven hundred five thousand, four hundred nine".