20813284 has 24 divisors (see below), whose sum is σ = 38586240. Its totient is φ = 9795744.

The previous prime is 20813279. The next prime is 20813291. The reversal of 20813284 is 48231802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12357 + ... + 13939.

It is an arithmetic number, because the mean of its divisors is an integer number (1607760).

Almost surely, 2^20813284 is an apocalyptic number.

It is an amenable number.

20813284 is a deficient number, since it is larger than the sum of its proper divisors (17772956).

20813284 is a wasteful number, since it uses less digits than its factorization.

20813284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20813284 is about 4562.1578227852. The cubic root of 20813284 is about 275.0723071570.

The spelling of 20813284 in words is "twenty million, eight hundred thirteen thousand, two hundred eighty-four".