20540142 has 80 divisors (see below), whose sum is σ = 53665920. Its totient is φ = 5750352.

The previous prime is 20540141. The next prime is 20540161. The reversal of 20540142 is 24104502.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540141) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 66753 + ... + 67059.

It is an arithmetic number, because the mean of its divisors is an integer number (670824).

Almost surely, 2^20540142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20540142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26832960).

20540142 is an abundant number, since it is smaller than the sum of its proper divisors (33125778).

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

20540142 is a wasteful number, since it uses less digits than its factorization.

20540142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20540142 is about 4532.1233434230. The cubic root of 20540142 is about 273.8637058135.

Adding to 20540142 its reverse (24104502), we get a palindrome (44644644).

The spelling of 20540142 in words is "twenty million, five hundred forty thousand, one hundred forty-two".