20518329 has 16 divisors (see below), whose sum is σ = 29869952. Its totient is φ = 12451968.

The previous prime is 20518307. The next prime is 20518331. The reversal of 20518329 is 92381502.

It is a happy number.

It is not a de Polignac number, because 20518329 - 2⁸ = 20518073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20518296 and 20518305.

It is not an unprimeable number, because it can be changed into a prime (20518229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 757 + ... + 6450.

It is an arithmetic number, because the mean of its divisors is an integer number (1866872).

Almost surely, 2^20518329 is an apocalyptic number.

It is an amenable number.

20518329 is a deficient number, since it is larger than the sum of its proper divisors (9351623).

20518329 is a wasteful number, since it uses less digits than its factorization.

20518329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7296.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20518329 is about 4529.7162162767. The cubic root of 20518329 is about 273.7667265274.

The spelling of 20518329 in words is "twenty million, five hundred eighteen thousand, three hundred twenty-nine".