20798648640 has 1120 divisors, whose sum is σ = 97825584384. Its totient is φ = 4060938240.

The previous prime is 20798648639. The next prime is 20798648669. The reversal of 20798648640 is 4684689702.

It is a tau number, because it is divible by the number of its divisors (1120).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 33928974 + ... + 33929586.

Almost surely, 2^20798648640 is an apocalyptic number.

20798648640 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 20798648640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48912792192).

20798648640 is an abundant number, since it is smaller than the sum of its proper divisors (77026935744).

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

20798648640 is a wasteful number, since it uses less digits than its factorization.

20798648640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 20798648640 in words is "twenty billion, seven hundred ninety-eight million, six hundred forty-eight thousand, six hundred forty".