20868236 has 6 divisors (see below), whose sum is σ = 36519420. Its totient is φ = 10434116.

The previous prime is 20868217. The next prime is 20868257. The reversal of 20868236 is 63286802.

It is a junction number, because it is equal to n+sod(n) for n = 20868196 and 20868205.

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 as a sum of consecutive naturals, namely, 2608526 + ... + 2608533.

It is an arithmetic number, because the mean of its divisors is an integer number (6086570).

Almost surely, 2^20868236 is an apocalyptic number.

It is an amenable number.

20868236 is a deficient number, since it is larger than the sum of its proper divisors (15651184).

20868236 is a wasteful number, since it uses less digits than its factorization.

20868236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5217063 (or 5217061 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 20868236 is about 4568.1764414261. The cubic root of 20868236 is about 275.3141797647.

The spelling of 20868236 in words is "twenty million, eight hundred sixty-eight thousand, two hundred thirty-six".