20439143 has 2 divisors, whose sum is σ = 20439144. Its totient is φ = 20439142.

The previous prime is 20439121. The next prime is 20439149. The reversal of 20439143 is 34193402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20439143 - 2¹⁸ = 20176999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20439149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219571 + 10219572.

It is an arithmetic number, because the mean of its divisors is an integer number (10219572).

Almost surely, 2^20439143 is an apocalyptic number.

20439143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20439143 is an equidigital number, since it uses as much as digits as its factorization.

20439143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20439143 is about 4520.9670425695. The cubic root of 20439143 is about 273.4140915776.

The spelling of 20439143 in words is "twenty million, four hundred thirty-nine thousand, one hundred forty-three".