20440400417 has 2 divisors, whose sum is σ = 20440400418. Its totient is φ = 20440400416.

The previous prime is 20440400377. The next prime is 20440400423. The reversal of 20440400417 is 71400404402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11634642496 + 8805757921 = 107864^2 + 93839^2 .

It is a cyclic number.

It is not a de Polignac number, because 20440400417 - 2¹⁰ = 20440399393 is a prime.

It is not a weakly prime, because it can be changed into another prime (20440400017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220200208 + 10220200209.

It is an arithmetic number, because the mean of its divisors is an integer number (10220200209).

Almost surely, 2^20440400417 is an apocalyptic number.

It is an amenable number.

20440400417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440400417 is an equidigital number, since it uses as much as digits as its factorization.

20440400417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 26.

Adding to 20440400417 its reverse (71400404402), we get a palindrome (91840804819).

The spelling of 20440400417 in words is "twenty billion, four hundred forty million, four hundred thousand, four hundred seventeen".