20448451840 has 36 divisors (see below), whose sum is σ = 48980435364. Its totient is φ = 8179380224.

The previous prime is 20448451831. The next prime is 20448451843. The reversal of 20448451840 is 4815484402.

It can be written as a sum of positive squares in 2 ways, for example, as 2718996736 + 17729455104 = 52144^2 + 133152^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 20448451793 and 20448451802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20448451843) 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 3 ways as a sum of consecutive naturals, for example, 7986397 + ... + 7988956.

It is an arithmetic number, because the mean of its divisors is an integer number (1360567649).

Almost surely, 2^20448451840 is an apocalyptic number.

20448451840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20448451840 is an abundant number, since it is smaller than the sum of its proper divisors (28531983524).

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

20448451840 is an equidigital number, since it uses as much as digits as its factorization.

20448451840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15975374 (or 15975360 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 40.

The spelling of 20448451840 in words is "twenty billion, four hundred forty-eight million, four hundred fifty-one thousand, eight hundred forty".