20404441 has 2 divisors, whose sum is σ = 20404442. Its totient is φ = 20404440.

The previous prime is 20404421. The next prime is 20404453. The reversal of 20404441 is 14440402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19758025 + 646416 = 4445^2 + 804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20404441 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202220 + 10202221.

It is an arithmetic number, because the mean of its divisors is an integer number (10202221).

Almost surely, 2^20404441 is an apocalyptic number.

It is an amenable number.

20404441 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404441 is an equidigital number, since it uses as much as digits as its factorization.

20404441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 20404441 is about 4517.1275164644. The cubic root of 20404441 is about 273.2592678891.

Adding to 20404441 its reverse (14440402), we get a palindrome (34844843).

The spelling of 20404441 in words is "twenty million, four hundred four thousand, four hundred forty-one".