20783104 has 56 divisors (see below), whose sum is σ = 43251120. Its totient is φ = 9977856.

The previous prime is 20783089. The next prime is 20783137. The reversal of 20783104 is 40138702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352227 + ... + 352285.

Almost surely, 2^20783104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20783104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21625560).

20783104 is an abundant number, since it is smaller than the sum of its proper divisors (22468016).

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

20783104 is an frugal number, since it uses more digits than its factorization.

20783104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20783104 is about 4558.8489775381. The cubic root of 20783104 is about 274.9392879749.

The spelling of 20783104 in words is "twenty million, seven hundred eighty-three thousand, one hundred four".