20893284 has 36 divisors (see below), whose sum is σ = 53415180. Its totient is φ = 6885120.

The previous prime is 20893277. The next prime is 20893297. The reversal of 20893284 is 48239802.

It can be written as a sum of positive squares in 2 ways, for example, as 12320100 + 8573184 = 3510^2 + 2928^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57 + ... + 6464.

It is an arithmetic number, because the mean of its divisors is an integer number (1483755).

Almost surely, 2^20893284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20893284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26707590).

20893284 is an abundant number, since it is smaller than the sum of its proper divisors (32521896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20893284 is a wasteful number, since it uses less digits than its factorization.

20893284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6620 (or 6615 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20893284 is about 4570.9171946120. The cubic root of 20893284 is about 275.4242882938.

The spelling of 20893284 in words is "twenty million, eight hundred ninety-three thousand, two hundred eighty-four".