20531142 has 12 divisors (see below), whose sum is σ = 44484180. Its totient is φ = 6843708.

The previous prime is 20531107. The next prime is 20531171. The reversal of 20531142 is 24113502.

20531142 is nontrivially palindromic in base 14.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1140619 = 20531142 / (2 + 0 + 5 + 3 + 1 + 1 + 4 + 2).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 570292 + ... + 570327.

It is an arithmetic number, because the mean of its divisors is an integer number (3707015).

Almost surely, 2^20531142 is an apocalyptic number.

20531142 is an abundant number, since it is smaller than the sum of its proper divisors (23953038).

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

20531142 is a wasteful number, since it uses less digits than its factorization.

20531142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140627 (or 1140624 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20531142 is about 4531.1303225575. The cubic root of 20531142 is about 273.8237006790.

Adding to 20531142 its reverse (24113502), we get a palindrome (44644644).

The spelling of 20531142 in words is "twenty million, five hundred thirty-one thousand, one hundred forty-two".