20286644 has 72 divisors (see below), whose sum is σ = 45386880. Its totient is φ = 7755264.

The previous prime is 20286613. The next prime is 20286653. The reversal of 20286644 is 44668202.

It is a happy number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20286644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 186062 + ... + 186170.

Almost surely, 2^20286644 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 20286644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22693440).

20286644 is an abundant number, since it is smaller than the sum of its proper divisors (25100236).

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

20286644 is a wasteful number, since it uses less digits than its factorization.

20286644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 20286644 is about 4504.0697152686. The cubic root of 20286644 is about 272.7324011292.

The spelling of 20286644 in words is "twenty million, two hundred eighty-six thousand, six hundred forty-four".