20485583280 has 60 divisors (see below), whose sum is σ = 68797419600. Its totient is φ = 5462822016.

The previous prime is 20485583233. The next prime is 20485583291. The reversal of 20485583280 is 8238558402.

20485583280 is a `hidden beast` number, since 2 + 0 + 48 + 5 + 583 + 28 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 11 ways as a sum of consecutive naturals, for example, 14225380 + ... + 14226819.

It is an arithmetic number, because the mean of its divisors is an integer number (1146623660).

Almost surely, 2^20485583280 is an apocalyptic number.

20485583280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20485583280 is an abundant number, since it is smaller than the sum of its proper divisors (48311836320).

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

20485583280 is a wasteful number, since it uses less digits than its factorization.

20485583280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28452218 (or 28452209 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 20485583280 in words is "twenty billion, four hundred eighty-five million, five hundred eighty-three thousand, two hundred eighty".