20428143 has 8 divisors (see below), whose sum is σ = 27307056. Its totient is φ = 13584000.

The previous prime is 20428141. The next prime is 20428157. The reversal of 20428143 is 34182402.

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

It is not a de Polignac number, because 20428143 - 2¹ = 20428141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20428141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7288 + ... + 9693.

It is an arithmetic number, because the mean of its divisors is an integer number (3413382).

Almost surely, 2^20428143 is an apocalyptic number.

20428143 is a deficient number, since it is larger than the sum of its proper divisors (6878913).

20428143 is a wasteful number, since it uses less digits than its factorization.

20428143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17385.

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

The square root of 20428143 is about 4519.7503249627. The cubic root of 20428143 is about 273.3650338341.

The spelling of 20428143 in words is "twenty million, four hundred twenty-eight thousand, one hundred forty-three".