13820543 has 16 divisors (see below), whose sum is σ = 16070400. Its totient is φ = 11753280.

The previous prime is 13820531. The next prime is 13820551. The reversal of 13820543 is 34502831.

It is a de Polignac number, because none of the positive numbers 2^k-13820543 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 (13820503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18230 + ... + 18972.

It is an arithmetic number, because the mean of its divisors is an integer number (1004400).

Almost surely, 2^13820543 is an apocalyptic number.

13820543 is a deficient number, since it is larger than the sum of its proper divisors (2249857).

13820543 is a wasteful number, since it uses less digits than its factorization.

13820543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 13820543 is about 3717.5990908112. The cubic root of 13820543 is about 239.9799925451.

The spelling of 13820543 in words is "thirteen million, eight hundred twenty thousand, five hundred forty-three".