20580399 has 56 divisors (see below), whose sum is σ = 36549920. Its totient is φ = 11337408.

The previous prime is 20580367. The next prime is 20580403. The reversal of 20580399 is 99308502.

It is not a de Polignac number, because 20580399 - 2⁵ = 20580367 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 (20580349) 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 55 ways as a sum of consecutive naturals, for example, 188757 + ... + 188865.

Almost surely, 2^20580399 is an apocalyptic number.

20580399 is a deficient number, since it is larger than the sum of its proper divisors (15969521).

20580399 is an equidigital number, since it uses as much as digits as its factorization.

20580399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20580399 is about 4536.5624651271. The cubic root of 20580399 is about 274.0425058819.

The spelling of 20580399 in words is "twenty million, five hundred eighty thousand, three hundred ninety-nine".