20783808 has 42 divisors (see below), whose sum is σ = 59574684. Its totient is φ = 6927744.

The previous prime is 20783797. The next prime is 20783813. The reversal of 20783808 is 80838702.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17466 + ... + 18617.

Almost surely, 2^20783808 is an apocalyptic number.

It is an amenable number.

20783808 is an abundant number, since it is smaller than the sum of its proper divisors (38790876).

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

20783808 is a wasteful number, since it uses less digits than its factorization.

20783808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36101 (or 36088 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 20783808 is about 4558.9261893564. The cubic root of 20783808 is about 274.9423923408.

It can be divided in two parts, 2078 and 3808, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 20783808 in words is "twenty million, seven hundred eighty-three thousand, eight hundred eight".