20045205540 has 48 divisors (see below), whose sum is σ = 62362863360. Its totient is φ = 5345388000.

The previous prime is 20045205539. The next prime is 20045205559. The reversal of 20045205540 is 4550254002.

20045205540 is a `hidden beast` number, since 200 + 452 + 0 + 5 + 5 + 4 + 0 = 666.

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

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 15 ways as a sum of consecutive naturals, for example, 18559836 + ... + 18560915.

It is an arithmetic number, because the mean of its divisors is an integer number (1299226320).

Almost surely, 2^20045205540 is an apocalyptic number.

20045205540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20045205540 is an abundant number, since it is smaller than the sum of its proper divisors (42317657820).

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

20045205540 is a wasteful number, since it uses less digits than its factorization.

20045205540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37120769 (or 37120761 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

Adding to 20045205540 its reverse (4550254002), we get a palindrome (24595459542).

The spelling of 20045205540 in words is "twenty billion, forty-five million, two hundred five thousand, five hundred forty".