20783328 has 24 divisors (see below), whose sum is σ = 54556488. Its totient is φ = 6927744.

The previous prime is 20783291. The next prime is 20783339. The reversal of 20783328 is 82338702.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108151 + ... + 108342.

It is an arithmetic number, because the mean of its divisors is an integer number (2273187).

Almost surely, 2^20783328 is an apocalyptic number.

It is an amenable number.

20783328 is an abundant number, since it is smaller than the sum of its proper divisors (33773160).

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

20783328 is a wasteful number, since it uses less digits than its factorization.

20783328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216506 (or 216498 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20783328 is about 4558.8735450767. The cubic root of 20783328 is about 274.9402757353.

The spelling of 20783328 in words is "twenty million, seven hundred eighty-three thousand, three hundred twenty-eight".