20823868 has 48 divisors (see below), whose sum is σ = 41050240. Its totient is φ = 9180864.

The previous prime is 20823857. The next prime is 20823871. The reversal of 20823868 is 86832802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149743 + ... + 149881.

Almost surely, 2^20823868 is an apocalyptic number.

It is an amenable number.

20823868 is a deficient number, since it is larger than the sum of its proper divisors (20226372).

20823868 is a wasteful number, since it uses less digits than its factorization.

20823868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 20823868 is about 4563.3176527610. The cubic root of 20823868 is about 275.1189259726.

Subtracting from 20823868 its sum of digits (37), we obtain a triangular number (20823831 = T₆₄₅₃).

The spelling of 20823868 in words is "twenty million, eight hundred twenty-three thousand, eight hundred sixty-eight".