20386129 has 4 divisors (see below), whose sum is σ = 20395684. Its totient is φ = 20376576.

The previous prime is 20386123. The next prime is 20386133. The reversal of 20386129 is 92168302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13337104 + 7049025 = 3652^2 + 2655^2 .

It is a cyclic number.

It is not a de Polignac number, because 20386129 - 2¹⁷ = 20255057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20386129.

It is not an unprimeable number, because it can be changed into a prime (20386123) 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 3 ways as a sum of consecutive naturals, for example, 49 + ... + 6385.

It is an arithmetic number, because the mean of its divisors is an integer number (5098921).

Almost surely, 2^20386129 is an apocalyptic number.

It is an amenable number.

20386129 is a deficient number, since it is larger than the sum of its proper divisors (9555).

20386129 is an equidigital number, since it uses as much as digits as its factorization.

20386129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9554.

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

The square root of 20386129 is about 4515.1001096321. The cubic root of 20386129 is about 273.1774977590.

The spelling of 20386129 in words is "twenty million, three hundred eighty-six thousand, one hundred twenty-nine".