20784222 has 32 divisors (see below), whose sum is σ = 47266560. Its totient is φ = 6766200.

The previous prime is 20784221. The next prime is 20784223. The reversal of 20784222 is 22248702.

It is an interprime number because it is at equal distance from previous prime (20784221) and next prime (20784223).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20784221) 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, 2154 + ... + 6797.

It is an arithmetic number, because the mean of its divisors is an integer number (1477080).

Almost surely, 2^20784222 is an apocalyptic number.

20784222 is an abundant number, since it is smaller than the sum of its proper divisors (26482338).

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

20784222 is a wasteful number, since it uses less digits than its factorization.

20784222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9005 (or 8999 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20784222 is about 4558.9715945595. The cubic root of 20784222 is about 274.9442178868.

The spelling of 20784222 in words is "twenty million, seven hundred eighty-four thousand, two hundred twenty-two".