20606143 has 2 divisors, whose sum is σ = 20606144. Its totient is φ = 20606142.

The previous prime is 20606141. The next prime is 20606171. The reversal of 20606143 is 34160602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20606143 - 2¹ = 20606141 is a prime.

It is a super-2 number, since 2×20606143² = 849226258672898, which contains 22 as substring.

Together with 20606141, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20606141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10303071 + 10303072.

It is an arithmetic number, because the mean of its divisors is an integer number (10303072).

Almost surely, 2^20606143 is an apocalyptic number.

20606143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20606143 is an equidigital number, since it uses as much as digits as its factorization.

20606143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20606143 is about 4539.3989690266. The cubic root of 20606143 is about 274.1567247662.

Adding to 20606143 its reverse (34160602), we get a palindrome (54766745).

The spelling of 20606143 in words is "twenty million, six hundred six thousand, one hundred forty-three".