20431396 has 12 divisors (see below), whose sum is σ = 36083740. Its totient is φ = 10121760.

The previous prime is 20431381. The next prime is 20431409. The reversal of 20431396 is 69313402.

It can be written as a sum of positive squares in 2 ways, for example, as 11128896 + 9302500 = 3336^2 + 3050^2 .

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, 22995 + ... + 23866.

Almost surely, 2^20431396 is an apocalyptic number.

It is an amenable number.

20431396 is a deficient number, since it is larger than the sum of its proper divisors (15652344).

20431396 is a wasteful number, since it uses less digits than its factorization.

20431396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46974 (or 46972 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20431396 is about 4520.1101756484. The cubic root of 20431396 is about 273.3795433803.

Adding to 20431396 its reverse (69313402), we get a palindrome (89744798).

The spelling of 20431396 in words is "twenty million, four hundred thirty-one thousand, three hundred ninety-six".