20294591 has 4 divisors (see below), whose sum is σ = 20328312. Its totient is φ = 20260872.

The previous prime is 20294563. The next prime is 20294597. The reversal of 20294591 is 19549202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19549202 = 2 ⋅9774601.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20294591 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20294597) 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, 15941 + ... + 17166.

It is an arithmetic number, because the mean of its divisors is an integer number (5082078).

Almost surely, 2^20294591 is an apocalyptic number.

20294591 is a deficient number, since it is larger than the sum of its proper divisors (33721).

20294591 is an equidigital number, since it uses as much as digits as its factorization.

20294591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33720.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 20294591 is about 4504.9518310410. The cubic root of 20294591 is about 272.7680094739.

It can be divided in two parts, 2029 and 4591, that multiplied together give a palindrome (9315139).

The spelling of 20294591 in words is "twenty million, two hundred ninety-four thousand, five hundred ninety-one".