20820896 has 24 divisors (see below), whose sum is σ = 41239044. Its totient is φ = 10347520.

The previous prime is 20820889. The next prime is 20820929. The reversal of 20820896 is 69802802.

It can be written as a sum of positive squares in 2 ways, for example, as 19891600 + 929296 = 4460^2 + 964^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3656 + ... + 7416.

Almost surely, 2^20820896 is an apocalyptic number.

It is an amenable number.

20820896 is a deficient number, since it is larger than the sum of its proper divisors (20418148).

20820896 is a wasteful number, since it uses less digits than its factorization.

20820896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944 (or 3936 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20820896 is about 4562.9920008696. The cubic root of 20820896 is about 275.1058369481.

The spelling of 20820896 in words is "twenty million, eight hundred twenty thousand, eight hundred ninety-six".