20993310720 has 384 divisors, whose sum is σ = 76062542400. Its totient is φ = 5346164736.

The previous prime is 20993310719. The next prime is 20993310721. The reversal of 20993310720 is 2701339902.

It is an interprime number because it is at equal distance from previous prime (20993310719) and next prime (20993310721).

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993310721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33914571 + ... + 33915189.

Almost surely, 2^20993310720 is an apocalyptic number.

20993310720 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 20993310720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38031271200).

20993310720 is an abundant number, since it is smaller than the sum of its proper divisors (55069231680).

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

20993310720 is an equidigital number, since it uses as much as digits as its factorization.

20993310720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The spelling of 20993310720 in words is "twenty billion, nine hundred ninety-three million, three hundred ten thousand, seven hundred twenty".