20306980 has 12 divisors (see below), whose sum is σ = 42644700. Its totient is φ = 8122784.

The previous prime is 20306977. The next prime is 20306987. The reversal of 20306980 is 8960302.

It can be written as a sum of positive squares in 2 ways, for example, as 5607424 + 14699556 = 2368^2 + 3834^2 .

It is not an unprimeable number, because it can be changed into a prime (20306987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507655 + ... + 507694.

It is an arithmetic number, because the mean of its divisors is an integer number (3553725).

Almost surely, 2^20306980 is an apocalyptic number.

20306980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20306980 is an abundant number, since it is smaller than the sum of its proper divisors (22337720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20306980 is a wasteful number, since it uses less digits than its factorization.

20306980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015358 (or 1015356 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20306980 is about 4506.3266637029. The cubic root of 20306980 is about 272.8235026749.

The spelling of 20306980 in words is "twenty million, three hundred six thousand, nine hundred eighty".