20722273 has 24 divisors (see below), whose sum is σ = 24981696. Its totient is φ = 17035200.

The previous prime is 20722237. The next prime is 20722277. The reversal of 20722273 is 37222702.

It is not a de Polignac number, because 20722273 - 2¹⁷ = 20591201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20722277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131911 + ... + 132067.

It is an arithmetic number, because the mean of its divisors is an integer number (1040904).

Almost surely, 2^20722273 is an apocalyptic number.

It is an amenable number.

20722273 is a deficient number, since it is larger than the sum of its proper divisors (4259423).

20722273 is a wasteful number, since it uses less digits than its factorization.

20722273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 20722273 is about 4552.1723385654. The cubic root of 20722273 is about 274.6707817889.

Adding to 20722273 its reverse (37222702), we get a palindrome (57944975).

The spelling of 20722273 in words is "twenty million, seven hundred twenty-two thousand, two hundred seventy-three".