20143123 has 16 divisors (see below), whose sum is σ = 27046656. Its totient is φ = 14487840.

The previous prime is 20143099. The next prime is 20143129. The reversal of 20143123 is 32134102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20143123 - 2¹³ = 20134931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20143097 and 20143106.

It is not an unprimeable number, because it can be changed into a prime (20143129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9061 + ... + 11062.

It is an arithmetic number, because the mean of its divisors is an integer number (1690416).

Almost surely, 2^20143123 is an apocalyptic number.

20143123 is a deficient number, since it is larger than the sum of its proper divisors (6903533).

20143123 is a wasteful number, since it uses less digits than its factorization.

20143123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20154.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20143123 is about 4488.1090673022. The cubic root of 20143123 is about 272.0877159068.

Adding to 20143123 its reverse (32134102), we get a palindrome (52277225).

The spelling of 20143123 in words is "twenty million, one hundred forty-three thousand, one hundred twenty-three".