20398143 has 8 divisors (see below), whose sum is σ = 27232048. Its totient is φ = 13581504.

The previous prime is 20398139. The next prime is 20398193. The reversal of 20398143 is 34189302.

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

It is not a de Polignac number, because 20398143 - 2² = 20398139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20398143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20398123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246 + ... + 6507.

It is an arithmetic number, because the mean of its divisors is an integer number (3404006).

Almost surely, 2^20398143 is an apocalyptic number.

20398143 is a deficient number, since it is larger than the sum of its proper divisors (6833905).

20398143 is an equidigital number, since it uses as much as digits as its factorization.

20398143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8633.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20398143 is about 4516.4303382207. The cubic root of 20398143 is about 273.2311504160.

It can be divided in two parts, 203 and 98143, that added together give a triangular number (98346 = T₄₄₃).

The spelling of 20398143 in words is "twenty million, three hundred ninety-eight thousand, one hundred forty-three".