20778282 has 80 divisors (see below), whose sum is σ = 54153792. Its totient is φ = 5832000.

The previous prime is 20778253. The next prime is 20778283. The reversal of 20778282 is 28287702.

It is not an unprimeable number, because it can be changed into a prime (20778283) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 82657 + ... + 82907.

Almost surely, 2^20778282 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20778282, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27076896).

20778282 is an abundant number, since it is smaller than the sum of its proper divisors (33375510).

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

20778282 is a wasteful number, since it uses less digits than its factorization.

20778282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 20778282 is about 4558.3200852946. The cubic root of 20778282 is about 274.9180229481.

The spelling of 20778282 in words is "twenty million, seven hundred seventy-eight thousand, two hundred eighty-two".