20145580 has 48 divisors (see below), whose sum is σ = 52073280. Its totient is φ = 6375168.

The previous prime is 20145577. The next prime is 20145581. The reversal of 20145580 is 8554102.

It is not an unprimeable number, because it can be changed into a prime (20145581) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3715 + ... + 7354.

It is an arithmetic number, because the mean of its divisors is an integer number (1084860).

Almost surely, 2^20145580 is an apocalyptic number.

20145580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145580 is an abundant number, since it is smaller than the sum of its proper divisors (31927700).

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

20145580 is a wasteful number, since it uses less digits than its factorization.

20145580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11098 (or 11096 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 20145580 is about 4488.3827822502. The cubic root of 20145580 is about 272.0987782818.

Adding to 20145580 its reverse (8554102), we get a palindrome (28699682).

The spelling of 20145580 in words is "twenty million, one hundred forty-five thousand, five hundred eighty".