20997332 has 6 divisors (see below), whose sum is σ = 36745338. Its totient is φ = 10498664.

The previous prime is 20997313. The next prime is 20997349. The reversal of 20997332 is 23379902.

It can be written as a sum of positive squares in only one way, i.e., 20484676 + 512656 = 4526^2 + 716^2 .

It is a super-2 number, since 2×20997332² = 881775902236448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20997292 and 20997301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2624663 + ... + 2624670.

It is an arithmetic number, because the mean of its divisors is an integer number (6124223).

Almost surely, 2^20997332 is an apocalyptic number.

It is an amenable number.

20997332 is a deficient number, since it is larger than the sum of its proper divisors (15748006).

20997332 is a wasteful number, since it uses less digits than its factorization.

20997332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5249337 (or 5249335 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 35.

The square root of 20997332 is about 4582.2845830437. The cubic root of 20997332 is about 275.8807333184.

The spelling of 20997332 in words is "twenty million, nine hundred ninety-seven thousand, three hundred thirty-two".