20984984 has 8 divisors (see below), whose sum is σ = 39346860. Its totient is φ = 10492488.

The previous prime is 20984963. The next prime is 20985001. The reversal of 20984984 is 48948902.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1311554 + ... + 1311569.

Almost surely, 2^20984984 is an apocalyptic number.

It is an amenable number.

20984984 is a deficient number, since it is larger than the sum of its proper divisors (18361876).

20984984 is a wasteful number, since it uses less digits than its factorization.

20984984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623129 (or 2623125 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 20984984 is about 4580.9370220513. The cubic root of 20984984 is about 275.8266432196.

The spelling of 20984984 in words is "twenty million, nine hundred eighty-four thousand, nine hundred eighty-four".