20984670 has 80 divisors (see below), whose sum is σ = 64503648. Its totient is φ = 4795200.

The previous prime is 20984633. The next prime is 20984729. The reversal of 20984670 is 7648902.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 3820 + ... + 7520.

Almost surely, 2^20984670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20984670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32251824).

20984670 is an abundant number, since it is smaller than the sum of its proper divisors (43518978).

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

20984670 is a wasteful number, since it uses less digits than its factorization.

20984670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3727 (or 3718 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20984670 is about 4580.9027494589. The cubic root of 20984670 is about 275.8252674740.

The spelling of 20984670 in words is "twenty million, nine hundred eighty-four thousand, six hundred seventy".