20324521644 has 72 divisors (see below), whose sum is σ = 55219046400. Its totient is φ = 5801481504.

The previous prime is 20324521621. The next prime is 20324521667. The reversal of 20324521644 is 44612542302.

It is an interprime number because it is at equal distance from previous prime (20324521621) and next prime (20324521667).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 623257 + ... + 655055.

It is an arithmetic number, because the mean of its divisors is an integer number (766931200).

Almost surely, 2^20324521644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20324521644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27609523200).

20324521644 is an abundant number, since it is smaller than the sum of its proper divisors (34894524756).

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

20324521644 is a wasteful number, since it uses less digits than its factorization.

20324521644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32907 (or 32898 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 33.

The spelling of 20324521644 in words is "twenty billion, three hundred twenty-four million, five hundred twenty-one thousand, six hundred forty-four".