20997322 has 8 divisors (see below), whose sum is σ = 31566276. Its totient is φ = 10475232.

The previous prime is 20997313. The next prime is 20997349. The reversal of 20997322 is 22379902.

It can be written as a sum of positive squares in 2 ways, for example, as 19811401 + 1185921 = 4451^2 + 1089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10573 + ... + 12400.

Almost surely, 2^20997322 is an apocalyptic number.

20997322 is a deficient number, since it is larger than the sum of its proper divisors (10568954).

20997322 is a wasteful number, since it uses less digits than its factorization.

20997322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23432.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20997322 is about 4582.2834918848. The cubic root of 20997322 is about 275.8806895222.

The spelling of 20997322 in words is "twenty million, nine hundred ninety-seven thousand, three hundred twenty-two".