20318980 has 48 divisors (see below), whose sum is σ = 49008960. Its totient is φ = 6998400.

The previous prime is 20318971. The next prime is 20318989. The reversal of 20318980 is 8981302.

It is an interprime number because it is at equal distance from previous prime (20318971) and next prime (20318989).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20318989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1750 + ... + 6610.

It is an arithmetic number, because the mean of its divisors is an integer number (1021020).

Almost surely, 2^20318980 is an apocalyptic number.

20318980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20318980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24504480).

20318980 is an abundant number, since it is smaller than the sum of its proper divisors (28689980).

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

20318980 is a wasteful number, since it uses less digits than its factorization.

20318980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4900 (or 4898 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20318980 is about 4507.6579284591. The cubic root of 20318980 is about 272.8772319405.

It can be divided in two parts, 2031 and 8980, that added together give a palindrome (11011).

The spelling of 20318980 in words is "twenty million, three hundred eighteen thousand, nine hundred eighty".