20043980 has 48 divisors (see below), whose sum is σ = 47416320. Its totient is φ = 7051200.

The previous prime is 20043967. The next prime is 20044009. The reversal of 20043980 is 8934002.

It is a super-2 number, since 2×20043980² = 803522268480800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5351 + ... + 8289.

It is an arithmetic number, because the mean of its divisors is an integer number (987840).

Almost surely, 2^20043980 is an apocalyptic number.

20043980 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 20043980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23708160).

20043980 is an abundant number, since it is smaller than the sum of its proper divisors (27372340).

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

20043980 is a wasteful number, since it uses less digits than its factorization.

20043980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2990 (or 2988 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20043980 is about 4477.0503682670. The cubic root of 20043980 is about 271.6405828060.

Adding to 20043980 its reverse (8934002), we get a palindrome (28977982).

The spelling of 20043980 in words is "twenty million, forty-three thousand, nine hundred eighty".