20142531 has 12 divisors (see below), whose sum is σ = 29384160. Its totient is φ = 13294800.

The previous prime is 20142517. The next prime is 20142547. The reversal of 20142531 is 13524102.

It is not a de Polignac number, because 20142531 - 2⁹ = 20142019 is a prime.

It is a super-2 number, since 2×20142531² = 811443110171922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20142511) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 10171 + ... + 11988.

It is an arithmetic number, because the mean of its divisors is an integer number (2448680).

Almost surely, 2^20142531 is an apocalyptic number.

20142531 is a deficient number, since it is larger than the sum of its proper divisors (9241629).

20142531 is a wasteful number, since it uses less digits than its factorization.

20142531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22266 (or 22263 counting only the distinct ones).

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

The square root of 20142531 is about 4488.0431147662. The cubic root of 20142531 is about 272.0850503568.

Adding to 20142531 its reverse (13524102), we get a palindrome (33666633).

The spelling of 20142531 in words is "twenty million, one hundred forty-two thousand, five hundred thirty-one".