20431269 has 6 divisors (see below), whose sum is σ = 29511846. Its totient is φ = 13620840.

The previous prime is 20431267. The next prime is 20431273. The reversal of 20431269 is 96213402.

It can be written as a sum of positive squares in only one way, i.e., 19027044 + 1404225 = 4362^2 + 1185^2 .

It is not a de Polignac number, because 20431269 - 2¹ = 20431267 is a prime.

It is a super-2 number, since 2×20431269² = 834873505900722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431261) 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 5 ways as a sum of consecutive naturals, for example, 1135062 + ... + 1135079.

It is an arithmetic number, because the mean of its divisors is an integer number (4918641).

Almost surely, 2^20431269 is an apocalyptic number.

It is an amenable number.

20431269 is a deficient number, since it is larger than the sum of its proper divisors (9080577).

20431269 is a wasteful number, since it uses less digits than its factorization.

20431269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270147 (or 2270144 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20431269 is about 4520.0961272964. The cubic root of 20431269 is about 273.3789769437.

The spelling of 20431269 in words is "twenty million, four hundred thirty-one thousand, two hundred sixty-nine".