20354591 has 2 divisors, whose sum is σ = 20354592. Its totient is φ = 20354590.

The previous prime is 20354561. The next prime is 20354603. The reversal of 20354591 is 19545302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20354591 - 2⁶ = 20354527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20354561) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177295 + 10177296.

It is an arithmetic number, because the mean of its divisors is an integer number (10177296).

Almost surely, 2^20354591 is an apocalyptic number.

20354591 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354591 is an equidigital number, since it uses as much as digits as its factorization.

20354591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 20354591 is about 4511.6062549828. The cubic root of 20354591 is about 273.0365535815.

Adding to 20354591 its reverse (19545302), we get a palindrome (39899893).

The spelling of 20354591 in words is "twenty million, three hundred fifty-four thousand, five hundred ninety-one".