20980984 has 8 divisors (see below), whose sum is σ = 39339360. Its totient is φ = 10490488.

The previous prime is 20980957. The next prime is 20980987. The reversal of 20980984 is 48908902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20980987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1311304 + ... + 1311319.

It is an arithmetic number, because the mean of its divisors is an integer number (4917420).

Almost surely, 2^20980984 is an apocalyptic number.

It is an amenable number.

20980984 is a deficient number, since it is larger than the sum of its proper divisors (18358376).

20980984 is a wasteful number, since it uses less digits than its factorization.

20980984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622629 (or 2622625 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 20980984 is about 4580.5004093439. The cubic root of 20980984 is about 275.8091167717.

The spelling of 20980984 in words is "twenty million, nine hundred eighty thousand, nine hundred eighty-four".