20709816750 has 320 divisors, whose sum is σ = 66618085248. Its totient is φ = 4702924800.

The previous prime is 20709816709. The next prime is 20709816761. The reversal of 20709816750 is 5761890702.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 20709816696 and 20709816705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 27357372 + ... + 27358128.

Almost surely, 2^20709816750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20709816750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33309042624).

20709816750 is an abundant number, since it is smaller than the sum of its proper divisors (45908268498).

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

20709816750 is a wasteful number, since it uses less digits than its factorization.

20709816750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986 (or 967 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 20709816750 in words is "twenty billion, seven hundred nine million, eight hundred sixteen thousand, seven hundred fifty".