20782530 has 72 divisors (see below), whose sum is σ = 56206332. Its totient is φ = 5323968.

The previous prime is 20782513. The next prime is 20782543. The reversal of 20782530 is 3528702.

It can be written as a sum of positive squares in 2 ways, for example, as 20277009 + 505521 = 4503^2 + 711^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20782494 and 20782503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 263031 + ... + 263109.

Almost surely, 2^20782530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20782530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28103166).

20782530 is an abundant number, since it is smaller than the sum of its proper divisors (35423802).

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

20782530 is a wasteful number, since it uses less digits than its factorization.

20782530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 126 counting only the distinct ones).

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

The square root of 20782530 is about 4558.7860226161. The cubic root of 20782530 is about 274.9367568066.

It can be divided in two parts, 20782 and 530, that added together give a palindrome (21312).

The spelling of 20782530 in words is "twenty million, seven hundred eighty-two thousand, five hundred thirty".