20045480 has 64 divisors (see below), whose sum is σ = 55520640. Its totient is φ = 6342912.

The previous prime is 20045477. The next prime is 20045497. The reversal of 20045480 is 8454002.

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, 887 + ... + 6393.

It is an arithmetic number, because the mean of its divisors is an integer number (867510).

Almost surely, 2^20045480 is an apocalyptic number.

20045480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20045480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27760320).

20045480 is an abundant number, since it is smaller than the sum of its proper divisors (35475160).

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

20045480 is a wasteful number, since it uses less digits than its factorization.

20045480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5538 (or 5534 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20045480 is about 4477.2178861431. The cubic root of 20045480 is about 271.6473587509.

Adding to 20045480 its reverse (8454002), we get a palindrome (28499482).

The spelling of 20045480 in words is "twenty million, forty-five thousand, four hundred eighty".