20318680 has 32 divisors (see below), whose sum is σ = 45878400. Its totient is φ = 8098816.

The previous prime is 20318659. The next prime is 20318681. The reversal of 20318680 is 8681302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20318681) 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 7 ways as a sum of consecutive naturals, for example, 13401 + ... + 14839.

It is an arithmetic number, because the mean of its divisors is an integer number (1433700).

Almost surely, 2^20318680 is an apocalyptic number.

20318680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20318680 is an abundant number, since it is smaller than the sum of its proper divisors (25559720).

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

20318680 is a wasteful number, since it uses less digits than its factorization.

20318680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20318680 is about 4507.6246516319. The cubic root of 20318680 is about 272.8758889667.

Adding to 20318680 its reverse (8681302), we get a palindrome (28999982).

The spelling of 20318680 in words is "twenty million, three hundred eighteen thousand, six hundred eighty".