20773221 has 16 divisors (see below), whose sum is σ = 31868928. Its totient is φ = 11790000.

The previous prime is 20773219. The next prime is 20773231. The reversal of 20773221 is 12237702.

It is not a de Polignac number, because 20773221 - 2¹ = 20773219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20773191 and 20773200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20773231) 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, 105 + ... + 6446.

It is an arithmetic number, because the mean of its divisors is an integer number (1991808).

Almost surely, 2^20773221 is an apocalyptic number.

20773221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20773221 is a deficient number, since it is larger than the sum of its proper divisors (11095707).

20773221 is a wasteful number, since it uses less digits than its factorization.

20773221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6712.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 20773221 is about 4557.7649127615. The cubic root of 20773221 is about 274.8957003921.

The spelling of 20773221 in words is "twenty million, seven hundred seventy-three thousand, two hundred twenty-one".