20431276 has 12 divisors (see below), whose sum is σ = 36515808. Its totient is φ = 9998192.

The previous prime is 20431273. The next prime is 20431277. The reversal of 20431276 is 67213402.

It is a self number, because there is not a number n which added to its sum of digits gives 20431276.

It is not an unprimeable number, because it can be changed into a prime (20431273) 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 3 ways as a sum of consecutive naturals, for example, 54151 + ... + 54526.

It is an arithmetic number, because the mean of its divisors is an integer number (3042984).

Almost surely, 2^20431276 is an apocalyptic number.

It is an amenable number.

20431276 is a deficient number, since it is larger than the sum of its proper divisors (16084532).

20431276 is a wasteful number, since it uses less digits than its factorization.

20431276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108728 (or 108726 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20431276 is about 4520.0969016162. The cubic root of 20431276 is about 273.3790081646.

Adding to 20431276 its reverse (67213402), we get a palindrome (87644678).

The spelling of 20431276 in words is "twenty million, four hundred thirty-one thousand, two hundred seventy-six".