20778112 has 32 divisors (see below), whose sum is σ = 41616000. Its totient is φ = 10333440.

The previous prime is 20778083. The next prime is 20778113. The reversal of 20778112 is 21187702.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (20778113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34389 + ... + 34987.

It is an arithmetic number, because the mean of its divisors is an integer number (1300500).

Almost surely, 2^20778112 is an apocalyptic number.

It is an amenable number.

20778112 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20778112 is an equidigital number, since it uses as much as digits as its factorization.

20778112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884 (or 872 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 20778112 is about 4558.3014380359. The cubic root of 20778112 is about 274.9172731878.

The spelling of 20778112 in words is "twenty million, seven hundred seventy-eight thousand, one hundred twelve".