20743647220 has 48 divisors (see below), whose sum is σ = 45139525200. Its totient is φ = 7997875200.

The previous prime is 20743647193. The next prime is 20743647277. The reversal of 20743647220 is 2274634702.

It can be written as a sum of positive squares in 8 ways, for example, as 505170576 + 20238476644 = 22476^2 + 142262^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20743647220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318826 + ... + 378334.

It is an arithmetic number, because the mean of its divisors is an integer number (940406775).

Almost surely, 2^20743647220 is an apocalyptic number.

20743647220 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 20743647220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22569762600).

20743647220 is an abundant number, since it is smaller than the sum of its proper divisors (24395877980).

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

20743647220 is a wasteful number, since it uses less digits than its factorization.

20743647220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60148 (or 60146 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 37.

The spelling of 20743647220 in words is "twenty billion, seven hundred forty-three million, six hundred forty-seven thousand, two hundred twenty".