20785356 has 48 divisors (see below), whose sum is σ = 57062880. Its totient is φ = 6520320.

The previous prime is 20785337. The next prime is 20785357. The reversal of 20785356 is 65358702.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20785356.

It is not an unprimeable number, because it can be changed into a prime (20785357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3825 + ... + 7496.

It is an arithmetic number, because the mean of its divisors is an integer number (1188810).

Almost surely, 2^20785356 is an apocalyptic number.

It is an amenable number.

20785356 is an abundant number, since it is smaller than the sum of its proper divisors (36277524).

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

20785356 is a wasteful number, since it uses less digits than its factorization.

20785356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11351 (or 11343 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 20785356 is about 4559.0959630172. The cubic root of 20785356 is about 274.9492181714.

The spelling of 20785356 in words is "twenty million, seven hundred eighty-five thousand, three hundred fifty-six".