20041391 has 2 divisors, whose sum is σ = 20041392. Its totient is φ = 20041390.

The previous prime is 20041387. The next prime is 20041403. The reversal of 20041391 is 19314002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20041391 - 2² = 20041387 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20041591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10020695 + 10020696.

It is an arithmetic number, because the mean of its divisors is an integer number (10020696).

Almost surely, 2^20041391 is an apocalyptic number.

20041391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20041391 is an equidigital number, since it uses as much as digits as its factorization.

20041391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20041391 is about 4476.7612176662. The cubic root of 20041391 is about 271.6288867298.

Adding to 20041391 its reverse (19314002), we get a palindrome (39355393).

The spelling of 20041391 in words is "twenty million, forty-one thousand, three hundred ninety-one".