20532769 has 2 divisors, whose sum is σ = 20532770. Its totient is φ = 20532768.

The previous prime is 20532751. The next prime is 20532791. The reversal of 20532769 is 96723502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20142144 + 390625 = 4488^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 20532769 - 2⁵ = 20532737 is a prime.

It is a super-2 number, since 2×20532769² = 843189205614722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20532709) by changing a digit.

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 as a sum of consecutive naturals, namely, 10266384 + 10266385.

It is an arithmetic number, because the mean of its divisors is an integer number (10266385).

Almost surely, 2^20532769 is an apocalyptic number.

It is an amenable number.

20532769 is a deficient number, since it is larger than the sum of its proper divisors (1).

20532769 is an equidigital number, since it uses as much as digits as its factorization.

20532769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 20532769 is about 4531.3098547771. The cubic root of 20532769 is about 273.8309335839.

The spelling of 20532769 in words is "twenty million, five hundred thirty-two thousand, seven hundred sixty-nine".