20328530 has 8 divisors (see below), whose sum is σ = 36591372. Its totient is φ = 8131408.

The previous prime is 20328479. The next prime is 20328533. The reversal of 20328530 is 3582302.

It can be written as a sum of positive squares in 2 ways, for example, as 19439281 + 889249 = 4409^2 + 943^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20328496 and 20328505.

It is not an unprimeable number, because it can be changed into a prime (20328533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1016417 + ... + 1016436.

Almost surely, 2^20328530 is an apocalyptic number.

20328530 is a deficient number, since it is larger than the sum of its proper divisors (16262842).

20328530 is a wasteful number, since it uses less digits than its factorization.

20328530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032860.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20328530 is about 4508.7171124390. The cubic root of 20328530 is about 272.9199763663.

The spelling of 20328530 in words is "twenty million, three hundred twenty-eight thousand, five hundred thirty".