20980305 has 24 divisors (see below), whose sum is σ = 36653760. Its totient is φ = 11100960.

The previous prime is 20980277. The next prime is 20980307. The reversal of 20980305 is 50308902.

It is not a de Polignac number, because 20980305 - 2⁶ = 20980241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20980307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4116 + ... + 7674.

It is an arithmetic number, because the mean of its divisors is an integer number (1527240).

Almost surely, 2^20980305 is an apocalyptic number.

It is an amenable number.

20980305 is a deficient number, since it is larger than the sum of its proper divisors (15673455).

20980305 is a wasteful number, since it uses less digits than its factorization.

20980305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701 (or 3698 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20980305 is about 4580.4262902049. The cubic root of 20980305 is about 275.8061414361.

The spelling of 20980305 in words is "twenty million, nine hundred eighty thousand, three hundred five".