20671722 has 36 divisors (see below), whose sum is σ = 46567170. Its totient is φ = 6619536.

The previous prime is 20671661. The next prime is 20671723. The reversal of 20671722 is 22717602.

It can be written as a sum of positive squares in only one way, i.e., 17464041 + 3207681 = 4179^2 + 1791^2 .

It is not an unprimeable number, because it can be changed into a prime (20671723) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 103779 + ... + 103977.

Almost surely, 2^20671722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20671722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23283585).

20671722 is an abundant number, since it is smaller than the sum of its proper divisors (25895448).

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

20671722 is a wasteful number, since it uses less digits than its factorization.

20671722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 20671722 is about 4546.6165442008. The cubic root of 20671722 is about 274.4472511540.

The spelling of 20671722 in words is "twenty million, six hundred seventy-one thousand, seven hundred twenty-two".