20995328 has 18 divisors (see below), whose sum is σ = 41909154. Its totient is φ = 10497536.

The previous prime is 20995307. The next prime is 20995349. The reversal of 20995328 is 82359902.

It is an interprime number because it is at equal distance from previous prime (20995307) and next prime (20995349).

It can be written as a sum of positive squares in only one way, i.e., 10549504 + 10445824 = 3248^2 + 3232^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20995291 and 20995300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40751 + ... + 41262.

Almost surely, 2^20995328 is an apocalyptic number.

It is an amenable number.

20995328 is a deficient number, since it is larger than the sum of its proper divisors (20913826).

20995328 is an frugal number, since it uses more digits than its factorization.

20995328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82029 (or 82015 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 20995328 is about 4582.0659096089. The cubic root of 20995328 is about 275.8719562893.

The spelling of 20995328 in words is "twenty million, nine hundred ninety-five thousand, three hundred twenty-eight".