20143047 has 4 divisors (see below), whose sum is σ = 26857400. Its totient is φ = 13428696.

The previous prime is 20143043. The next prime is 20143061. The reversal of 20143047 is 74034102.

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

It is not a de Polignac number, because 20143047 - 2² = 20143043 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 (20143043) 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, 3357172 + ... + 3357177.

It is an arithmetic number, because the mean of its divisors is an integer number (6714350).

Almost surely, 2^20143047 is an apocalyptic number.

20143047 is a deficient number, since it is larger than the sum of its proper divisors (6714353).

20143047 is an equidigital number, since it uses as much as digits as its factorization.

20143047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6714352.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20143047 is about 4488.1006004768. The cubic root of 20143047 is about 272.0873737108.

Adding to 20143047 its reverse (74034102), we get a palindrome (94177149).

The spelling of 20143047 in words is "twenty million, one hundred forty-three thousand, forty-seven".