20348591 has 4 divisors (see below), whose sum is σ = 20392632. Its totient is φ = 20304552.

The previous prime is 20348579. The next prime is 20348593. The reversal of 20348591 is 19584302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19584302 = 2 ⋅9792151.

It is a cyclic number.

It is not a de Polignac number, because 20348591 - 2¹⁰ = 20347567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20348593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21320 + ... + 22253.

It is an arithmetic number, because the mean of its divisors is an integer number (5098158).

Almost surely, 2^20348591 is an apocalyptic number.

20348591 is a deficient number, since it is larger than the sum of its proper divisors (44041).

20348591 is an equidigital number, since it uses as much as digits as its factorization.

20348591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44040.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20348591 is about 4510.9412543282. The cubic root of 20348591 is about 273.0097229382.

The spelling of 20348591 in words is "twenty million, three hundred forty-eight thousand, five hundred ninety-one".