20827530 has 56 divisors (see below), whose sum is σ = 56228292. Its totient is φ = 5552064.

The previous prime is 20827517. The next prime is 20827571. The reversal of 20827530 is 3572802.

It can be written as a sum of positive squares in 2 ways, for example, as 20820969 + 6561 = 4563^2 + 81^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20827494 and 20827503.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5862 + ... + 8718.

Almost surely, 2^20827530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20827530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28114146).

20827530 is an abundant number, since it is smaller than the sum of its proper divisors (35400762).

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

20827530 is an equidigital number, since it uses as much as digits as its factorization.

20827530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882 (or 2867 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20827530 is about 4563.7188782834. The cubic root of 20827530 is about 275.1350521225.

The spelling of 20827530 in words is "twenty million, eight hundred twenty-seven thousand, five hundred thirty".