20197143 has 12 divisors (see below), whose sum is σ = 29852680. Its totient is φ = 13151376.

The previous prime is 20197141. The next prime is 20197159. The reversal of 20197143 is 34179102.

It is not a de Polignac number, because 20197143 - 2¹ = 20197141 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 (20197141) 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 11 ways as a sum of consecutive naturals, for example, 25708 + ... + 26481.

Almost surely, 2^20197143 is an apocalyptic number.

20197143 is a deficient number, since it is larger than the sum of its proper divisors (9655537).

20197143 is a wasteful number, since it uses less digits than its factorization.

20197143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52238 (or 52235 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20197143 is about 4494.1231625313. The cubic root of 20197143 is about 272.3307278556.

It can be divided in two parts, 201 and 97143, that added together give a square (97344 = 312²).

The spelling of 20197143 in words is "twenty million, one hundred ninety-seven thousand, one hundred forty-three".