20529693 has 30 divisors (see below), whose sum is σ = 32615066. Its totient is φ = 12866688.

The previous prime is 20529673. The next prime is 20529749. The reversal of 20529693 is 39692502.

It can be written as a sum of positive squares in 3 ways, for example, as 12131289 + 8398404 = 3483^2 + 2898^2 .

It is not a de Polignac number, because 20529693 - 2⁶ = 20529629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20529673) 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 in 29 ways as a sum of consecutive naturals, for example, 22971 + ... + 23847.

Almost surely, 2^20529693 is an apocalyptic number.

It is an amenable number.

20529693 is a deficient number, since it is larger than the sum of its proper divisors (12085373).

20529693 is an equidigital number, since it uses as much as digits as its factorization.

20529693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 20529693 is about 4530.9704258580. The cubic root of 20529693 is about 273.8172587597.

The spelling of 20529693 in words is "twenty million, five hundred twenty-nine thousand, six hundred ninety-three".