20304704240 has 80 divisors (see below), whose sum is σ = 47871846720. Its totient is φ = 8008550400.

The previous prime is 20304704227. The next prime is 20304704269. The reversal of 20304704240 is 4240740302.

It is a tau number, because it is divible by the number of its divisors (80).

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, 1648826 + ... + 1661094.

It is an arithmetic number, because the mean of its divisors is an integer number (598398084).

Almost surely, 2^20304704240 is an apocalyptic number.

20304704240 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 20304704240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23935923360).

20304704240 is an abundant number, since it is smaller than the sum of its proper divisors (27567142480).

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

20304704240 is a wasteful number, since it uses less digits than its factorization.

20304704240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12570 (or 12564 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 26.

The spelling of 20304704240 in words is "twenty billion, three hundred four million, seven hundred four thousand, two hundred forty".