20432143 has 2 divisors, whose sum is σ = 20432144. Its totient is φ = 20432142.

The previous prime is 20432123. The next prime is 20432149. The reversal of 20432143 is 34123402.

20432143 is nontrivially palindromic in base 13.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20432143 - 2²¹ = 18334991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20432143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20432149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10216071 + 10216072.

It is an arithmetic number, because the mean of its divisors is an integer number (10216072).

Almost surely, 2^20432143 is an apocalyptic number.

20432143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20432143 is an equidigital number, since it uses as much as digits as its factorization.

20432143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20432143 is about 4520.1928056223. The cubic root of 20432143 is about 273.3828750507.

Adding to 20432143 its reverse (34123402), we get a palindrome (54555545).

It can be divided in two parts, 2043 and 2143, that added together give a triangular number (4186 = T₉₁).

The spelling of 20432143 in words is "twenty million, four hundred thirty-two thousand, one hundred forty-three".