20439644160 has 576 divisors, whose sum is σ = 73667543040. Its totient is φ = 4830658560.

The previous prime is 20439644149. The next prime is 20439644177. The reversal of 20439644160 is 6144693402.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 160942017 + ... + 160942143.

It is an arithmetic number, because the mean of its divisors is an integer number (127895040).

Almost surely, 2^20439644160 is an apocalyptic number.

20439644160 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 20439644160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36833771520).

20439644160 is an abundant number, since it is smaller than the sum of its proper divisors (53227898880).

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

20439644160 is a wasteful number, since it uses less digits than its factorization.

20439644160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 20439644160 in words is "twenty billion, four hundred thirty-nine million, six hundred forty-four thousand, one hundred sixty".