20041591 has 2 divisors, whose sum is σ = 20041592. Its totient is φ = 20041590.

The previous prime is 20041583. The next prime is 20041607. The reversal of 20041591 is 19514002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20041591 - 2³ = 20041583 is a prime.

It is a super-2 number, since 2×20041591² = 803330739622562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20041501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10020795 + 10020796.

It is an arithmetic number, because the mean of its divisors is an integer number (10020796).

Almost surely, 2^20041591 is an apocalyptic number.

20041591 is a deficient number, since it is larger than the sum of its proper divisors (1).

20041591 is an equidigital number, since it uses as much as digits as its factorization.

20041591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 20041591 is about 4476.7835551878. The cubic root of 20041591 is about 271.6297902865.

Adding to 20041591 its reverse (19514002), we get a palindrome (39555593).

The spelling of 20041591 in words is "twenty million, forty-one thousand, five hundred ninety-one".