20284143 has 8 divisors (see below), whose sum is σ = 29504256. Its totient is φ = 12293400.

The previous prime is 20284129. The next prime is 20284151. The reversal of 20284143 is 34148202.

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

It is not a de Polignac number, because 20284143 - 2¹⁰ = 20283119 is a prime.

It is a super-2 number, since 2×20284143² = 822892914488898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284193) 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, 307303 + ... + 307368.

It is an arithmetic number, because the mean of its divisors is an integer number (3688032).

Almost surely, 2^20284143 is an apocalyptic number.

20284143 is a deficient number, since it is larger than the sum of its proper divisors (9220113).

20284143 is a wasteful number, since it uses less digits than its factorization.

20284143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614685.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20284143 is about 4503.7920689126. The cubic root of 20284143 is about 272.7211929049.

The spelling of 20284143 in words is "twenty million, two hundred eighty-four thousand, one hundred forty-three".