20490305 has 16 divisors (see below), whose sum is σ = 27091584. Its totient is φ = 14753280.

The previous prime is 20490299. The next prime is 20490311. The reversal of 20490305 is 50309402.

It is an interprime number because it is at equal distance from previous prime (20490299) and next prime (20490311).

It is not a de Polignac number, because 20490305 - 2¹⁰ = 20489281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3857 + ... + 7473.

It is an arithmetic number, because the mean of its divisors is an integer number (1693224).

Almost surely, 2^20490305 is an apocalyptic number.

It is an amenable number.

20490305 is a deficient number, since it is larger than the sum of its proper divisors (6601279).

20490305 is a wasteful number, since it uses less digits than its factorization.

20490305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3736.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20490305 is about 4526.6218088106. The cubic root of 20490305 is about 273.6420325814.

Adding to 20490305 its reverse (50309402), we get a palindrome (70799707).

It can be divided in two parts, 204 and 90305, that added together give a palindrome (90509).

The spelling of 20490305 in words is "twenty million, four hundred ninety thousand, three hundred five".