20785818 has 32 divisors (see below), whose sum is σ = 42923520. Its totient is φ = 6707120.

The previous prime is 20785763. The next prime is 20785819. The reversal of 20785818 is 81858702.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20785819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24721 + ... + 25547.

It is an arithmetic number, because the mean of its divisors is an integer number (1341360).

Almost surely, 2^20785818 is an apocalyptic number.

20785818 is an abundant number, since it is smaller than the sum of its proper divisors (22137702).

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

20785818 is a wasteful number, since it uses less digits than its factorization.

20785818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 20785818 is about 4559.1466306755. The cubic root of 20785818 is about 274.9512552722.

The spelling of 20785818 in words is "twenty million, seven hundred eighty-five thousand, eight hundred eighteen".