20328540 has 48 divisors (see below), whose sum is σ = 58464672. Its totient is φ = 5273856.

The previous prime is 20328533. The next prime is 20328541. The reversal of 20328540 is 4582302.

It is a self number, because there is not a number n which added to its sum of digits gives 20328540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20328541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2359 + ... + 6798.

It is an arithmetic number, because the mean of its divisors is an integer number (1218014).

Almost surely, 2^20328540 is an apocalyptic number.

20328540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20328540 is an abundant number, since it is smaller than the sum of its proper divisors (38136132).

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

20328540 is a wasteful number, since it uses less digits than its factorization.

20328540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9206 (or 9204 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20328540 is about 4508.7182214017. The cubic root of 20328540 is about 272.9200211179.

The spelling of 20328540 in words is "twenty million, three hundred twenty-eight thousand, five hundred forty".