20984143 has 8 divisors (see below), whose sum is σ = 21814128. Its totient is φ = 20168064.

The previous prime is 20984141. The next prime is 20984147. The reversal of 20984143 is 34148902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20984143 - 2¹ = 20984141 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 (20984141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346 + ... + 6487.

It is an arithmetic number, because the mean of its divisors is an integer number (2726766).

Almost surely, 2^20984143 is an apocalyptic number.

20984143 is a deficient number, since it is larger than the sum of its proper divisors (829985).

20984143 is an equidigital number, since it uses as much as digits as its factorization.

20984143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6953.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20984143 is about 4580.8452276845. The cubic root of 20984143 is about 275.8229584688.

It can be divided in two parts, 2098 and 4143, that added together give a square (6241 = 79²).

The spelling of 20984143 in words is "twenty million, nine hundred eighty-four thousand, one hundred forty-three".