20984646 has 16 divisors (see below), whose sum is σ = 42027264. Its totient is φ = 6985224.

The previous prime is 20984633. The next prime is 20984729. The reversal of 20984646 is 64648902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3351 + ... + 7293.

It is an arithmetic number, because the mean of its divisors is an integer number (2626704).

Almost surely, 2^20984646 is an apocalyptic number.

20984646 is an abundant number, since it is smaller than the sum of its proper divisors (21042618).

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

20984646 is a wasteful number, since it uses less digits than its factorization.

20984646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4835.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 20984646 is about 4580.9001298871. The cubic root of 20984646 is about 275.8251623209.

The spelling of 20984646 in words is "twenty million, nine hundred eighty-four thousand, six hundred forty-six".