20039980 has 24 divisors (see below), whose sum is σ = 43112160. Its totient is φ = 7820160.

The previous prime is 20039959. The next prime is 20039983. The reversal of 20039980 is 8993002.

It is a happy number.

20039980 is nontrivially palindromic in base 9.

It is not an unprimeable number, because it can be changed into a prime (20039983) 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, 11400 + ... + 13039.

It is an arithmetic number, because the mean of its divisors is an integer number (1796340).

Almost surely, 2^20039980 is an apocalyptic number.

20039980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20039980 is an abundant number, since it is smaller than the sum of its proper divisors (23072180).

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

20039980 is a wasteful number, since it uses less digits than its factorization.

20039980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24489 (or 24487 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20039980 is about 4476.6036232841. The cubic root of 20039980 is about 271.6225119668.

The spelling of 20039980 in words is "twenty million, thirty-nine thousand, nine hundred eighty".