20982543 has 4 divisors (see below), whose sum is σ = 27976728. Its totient is φ = 13988360.

The previous prime is 20982503. The next prime is 20982553. The reversal of 20982543 is 34528902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20982543 - 2⁸ = 20982287 is a prime.

It is a super-2 number, since 2×20982543² = 880534221493698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20982503) 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, 3497088 + ... + 3497093.

It is an arithmetic number, because the mean of its divisors is an integer number (6994182).

Almost surely, 2^20982543 is an apocalyptic number.

20982543 is a deficient number, since it is larger than the sum of its proper divisors (6994185).

20982543 is an equidigital number, since it uses as much as digits as its factorization.

20982543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6994184.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 20982543 is about 4580.6705840957. The cubic root of 20982543 is about 275.8159479697.

The spelling of 20982543 in words is "twenty million, nine hundred eighty-two thousand, five hundred forty-three".