20831269 has 2 divisors, whose sum is σ = 20831270. Its totient is φ = 20831268.

The previous prime is 20831267. The next prime is 20831281. The reversal of 20831269 is 96213802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14516100 + 6315169 = 3810^2 + 2513^2 .

It is a cyclic number.

It is not a de Polignac number, because 20831269 - 2¹ = 20831267 is a prime.

It is a super-2 number, since 2×20831269² = 867883536300722, which contains 22 as substring.

Together with 20831267, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20831269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20831267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415634 + 10415635.

It is an arithmetic number, because the mean of its divisors is an integer number (10415635).

Almost surely, 2^20831269 is an apocalyptic number.

It is an amenable number.

20831269 is a deficient number, since it is larger than the sum of its proper divisors (1).

20831269 is an equidigital number, since it uses as much as digits as its factorization.

20831269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20831269 is about 4564.1285038877. The cubic root of 20831269 is about 275.1515154030.

The spelling of 20831269 in words is "twenty million, eight hundred thirty-one thousand, two hundred sixty-nine".