20814843 has 16 divisors (see below), whose sum is σ = 32394240. Its totient is φ = 11640576.

The previous prime is 20814811. The next prime is 20814863. The reversal of 20814843 is 34841802.

It is not a de Polignac number, because 20814843 - 2⁵ = 20814811 is a prime.

It is a super-2 number, since 2×20814843² = 866515378229298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20814843.

It is not an unprimeable number, because it can be changed into a prime (20814863) 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, 9558 + ... + 11531.

It is an arithmetic number, because the mean of its divisors is an integer number (2024640).

Almost surely, 2^20814843 is an apocalyptic number.

20814843 is a deficient number, since it is larger than the sum of its proper divisors (11579397).

20814843 is a wasteful number, since it uses less digits than its factorization.

20814843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21146.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 20814843 is about 4562.3286817151. The cubic root of 20814843 is about 275.0791749988.

It can be divided in two parts, 208 and 14843, that added together give a palindrome (15051).

The spelling of 20814843 in words is "twenty million, eight hundred fourteen thousand, eight hundred forty-three".