20123142 has 16 divisors (see below), whose sum is σ = 43342320. Its totient is φ = 6191712.

The previous prime is 20123141. The next prime is 20123143. The reversal of 20123142 is 24132102.

It is an interprime number because it is at equal distance from previous prime (20123141) and next prime (20123143).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123141) 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, 128917 + ... + 129072.

It is an arithmetic number, because the mean of its divisors is an integer number (2708895).

Almost surely, 2^20123142 is an apocalyptic number.

20123142 is an abundant number, since it is smaller than the sum of its proper divisors (23219178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20123142 is a wasteful number, since it uses less digits than its factorization.

20123142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258007.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20123142 is about 4485.8825218679. The cubic root of 20123142 is about 271.9977202087.

Adding to 20123142 its reverse (24132102), we get a palindrome (44255244).

The spelling of 20123142 in words is "twenty million, one hundred twenty-three thousand, one hundred forty-two".