20836530 has 96 divisors (see below), whose sum is σ = 63685440. Its totient is φ = 4659840.

The previous prime is 20836507. The next prime is 20836537. The reversal of 20836530 is 3563802.

20836530 is a `hidden beast` number, since 2 + 0 + 8 + 3 + 653 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20836494 and 20836503.

It is not an unprimeable number, because it can be changed into a prime (20836537) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12061 + ... + 13679.

It is an arithmetic number, because the mean of its divisors is an integer number (663390).

Almost surely, 2^20836530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20836530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31842720).

20836530 is an abundant number, since it is smaller than the sum of its proper divisors (42848910).

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

20836530 is a wasteful number, since it uses less digits than its factorization.

20836530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656 (or 1653 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20836530 is about 4564.7048097330. The cubic root of 20836530 is about 275.1746769025.

The spelling of 20836530 in words is "twenty million, eight hundred thirty-six thousand, five hundred thirty".