20203680 has 144 divisors (see below), whose sum is σ = 74118240. Its totient is φ = 4612608.

The previous prime is 20203657. The next prime is 20203709. The reversal of 20203680 is 8630202.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23091 + ... + 23949.

It is an arithmetic number, because the mean of its divisors is an integer number (514710).

Almost surely, 2^20203680 is an apocalyptic number.

20203680 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 20203680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37059120).

20203680 is an abundant number, since it is smaller than the sum of its proper divisors (53914560).

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

20203680 is a wasteful number, since it uses less digits than its factorization.

20203680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 876 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20203680 is about 4494.8503868316. The cubic root of 20203680 is about 272.3601055080.

Adding to 20203680 its reverse (8630202), we get a palindrome (28833882).

The spelling of 20203680 in words is "twenty million, two hundred three thousand, six hundred eighty".