20326543 has 4 divisors (see below), whose sum is σ = 21522240. Its totient is φ = 19130848.

The previous prime is 20326531. The next prime is 20326571. The reversal of 20326543 is 34562302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34562302 = 2 ⋅17281151.

It is not a de Polignac number, because 20326543 - 2⁵ = 20326511 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 (20326343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 597823 + ... + 597856.

It is an arithmetic number, because the mean of its divisors is an integer number (5380560).

Almost surely, 2^20326543 is an apocalyptic number.

20326543 is a deficient number, since it is larger than the sum of its proper divisors (1195697).

20326543 is a wasteful number, since it uses less digits than its factorization.

20326543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195696.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 20326543 is about 4508.4967561261. The cubic root of 20326543 is about 272.9110839433.

Adding to 20326543 its reverse (34562302), we get a palindrome (54888845).

The spelling of 20326543 in words is "twenty million, three hundred twenty-six thousand, five hundred forty-three".