20123139 has 8 divisors (see below), whose sum is σ = 27096912. Its totient is φ = 13282400.

The previous prime is 20123119. The next prime is 20123141. The reversal of 20123139 is 93132102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20123139 - 2¹¹ = 20121091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20123119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32904 + ... + 33509.

It is an arithmetic number, because the mean of its divisors is an integer number (3387114).

Almost surely, 2^20123139 is an apocalyptic number.

20123139 is a deficient number, since it is larger than the sum of its proper divisors (6973773).

20123139 is a wasteful number, since it uses less digits than its factorization.

20123139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66517.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20123139 is about 4485.8821874855. The cubic root of 20123139 is about 271.9977066920.

It can be divided in two parts, 2012 and 3139, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 20123139 in words is "twenty million, one hundred twenty-three thousand, one hundred thirty-nine".