20829668 has 12 divisors (see below), whose sum is σ = 37437372. Its totient is φ = 10133280.

The previous prime is 20829637. The next prime is 20829701. The reversal of 20829668 is 86692802.

It can be written as a sum of positive squares in 2 ways, for example, as 14915044 + 5914624 = 3862^2 + 2432^2 .

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, 70223 + ... + 70518.

It is an arithmetic number, because the mean of its divisors is an integer number (3119781).

Almost surely, 2^20829668 is an apocalyptic number.

It is an amenable number.

20829668 is a deficient number, since it is larger than the sum of its proper divisors (16607704).

20829668 is a wasteful number, since it uses less digits than its factorization.

20829668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140782 (or 140780 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 20829668 is about 4563.9531110650. The cubic root of 20829668 is about 275.1444662428.

The spelling of 20829668 in words is "twenty million, eight hundred twenty-nine thousand, six hundred sixty-eight".