20862543 has 12 divisors (see below), whose sum is σ = 30121800. Its totient is φ = 12838176.

The previous prime is 20862529. The next prime is 20862559. The reversal of 20862543 is 34526802.

It is not a de Polignac number, because 20862543 - 2⁵ = 20862511 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20862543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20862503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20068 + ... + 21081.

It is an arithmetic number, because the mean of its divisors is an integer number (2510150).

Almost surely, 2^20862543 is an apocalyptic number.

20862543 is a deficient number, since it is larger than the sum of its proper divisors (9259257).

20862543 is a wasteful number, since it uses less digits than its factorization.

20862543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41178 (or 41165 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20862543 is about 4567.5532837614. The cubic root of 20862543 is about 275.2891416130.

The spelling of 20862543 in words is "twenty million, eight hundred sixty-two thousand, five hundred forty-three".