20286630 has 96 divisors (see below), whose sum is σ = 64943424. Its totient is φ = 4278528.

The previous prime is 20286613. The next prime is 20286653. The reversal of 20286630 is 3668202.

20286630 is a `hidden beast` number, since 2 + 0 + 28 + 6 + 630 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20286594 and 20286603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6952 + ... + 9428.

It is an arithmetic number, because the mean of its divisors is an integer number (676494).

Almost surely, 2^20286630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20286630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32471712).

20286630 is an abundant number, since it is smaller than the sum of its proper divisors (44656794).

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

20286630 is a wasteful number, since it uses less digits than its factorization.

20286630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510 (or 2507 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20286630 is about 4504.0681611183. The cubic root of 20286630 is about 272.7323383908.

The spelling of 20286630 in words is "twenty million, two hundred eighty-six thousand, six hundred thirty".