20431282 has 4 divisors (see below), whose sum is σ = 30646926. Its totient is φ = 10215640.

The previous prime is 20431277. The next prime is 20431303. The reversal of 20431282 is 28213402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10439361 + 9991921 = 3231^2 + 3161^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 5107819 + ... + 5107822.

Almost surely, 2^20431282 is an apocalyptic number.

20431282 is a deficient number, since it is larger than the sum of its proper divisors (10215644).

20431282 is a wasteful number, since it uses less digits than its factorization.

20431282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10215643.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20431282 is about 4520.0975653187. The cubic root of 20431282 is about 273.3790349255.

Adding to 20431282 its reverse (28213402), we get a palindrome (48644684).

The spelling of 20431282 in words is "twenty million, four hundred thirty-one thousand, two hundred eighty-two".