20513944880 has 320 divisors, whose sum is σ = 59695429248. Its totient is φ = 6440878080.

The previous prime is 20513944873. The next prime is 20513944889. The reversal of 20513944880 is 8844931502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (20513944889) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 60872072 + ... + 60872408.

Almost surely, 2^20513944880 is an apocalyptic number.

20513944880 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 20513944880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29847714624).

20513944880 is an abundant number, since it is smaller than the sum of its proper divisors (39181484368).

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

20513944880 is a wasteful number, since it uses less digits than its factorization.

20513944880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 20513944880 in words is "twenty billion, five hundred thirteen million, nine hundred forty-four thousand, eight hundred eighty".