20397529 has 2 divisors, whose sum is σ = 20397530. Its totient is φ = 20397528.

The previous prime is 20397511. The next prime is 20397551. The reversal of 20397529 is 92579302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19713600 + 683929 = 4440^2 + 827^2 .

It is a cyclic number.

It is not a de Polignac number, because 20397529 - 2¹¹ = 20395481 is a prime.

It is not a weakly prime, because it can be changed into another prime (20397829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10198764 + 10198765.

It is an arithmetic number, because the mean of its divisors is an integer number (10198765).

Almost surely, 2^20397529 is an apocalyptic number.

It is an amenable number.

20397529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20397529 is an equidigital number, since it uses as much as digits as its factorization.

20397529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 20397529 is about 4516.3623636728. The cubic root of 20397529 is about 273.2284088983.

The spelling of 20397529 in words is "twenty million, three hundred ninety-seven thousand, five hundred twenty-nine".