20431016 has 16 divisors (see below), whose sum is σ = 38470740. Its totient is φ = 10172160.

The previous prime is 20431009. The next prime is 20431027. The reversal of 20431016 is 61013402.

It can be written as a sum of positive squares in 2 ways, for example, as 19838116 + 592900 = 4454^2 + 770^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20430985 and 20431003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3371 + ... + 7226.

Almost surely, 2^20431016 is an apocalyptic number.

It is an amenable number.

20431016 is a deficient number, since it is larger than the sum of its proper divisors (18039724).

20431016 is a wasteful number, since it uses less digits than its factorization.

20431016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10844 (or 10840 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20431016 is about 4520.0681410793. The cubic root of 20431016 is about 273.3778485235.

Adding to 20431016 its reverse (61013402), we get a palindrome (81444418).

The spelling of 20431016 in words is "twenty million, four hundred thirty-one thousand, sixteen".