20330640544 has 48 divisors (see below), whose sum is σ = 42562571688. Its totient is φ = 9526239232.

The previous prime is 20330640541. The next prime is 20330640557. The reversal of 20330640544 is 44504603302.

It can be written as a sum of positive squares in 4 ways, for example, as 13928720400 + 6401920144 = 118020^2 + 80012^2 .

It is not an unprimeable number, because it can be changed into a prime (20330640541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46554 + ... + 206950.

Almost surely, 2^20330640544 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 20330640544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21281285844).

20330640544 is an abundant number, since it is smaller than the sum of its proper divisors (22231931144).

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

20330640544 is a wasteful number, since it uses less digits than its factorization.

20330640544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160657 (or 160649 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 31.

The spelling of 20330640544 in words is "twenty billion, three hundred thirty million, six hundred forty thousand, five hundred forty-four".