20745750720 has 224 divisors, whose sum is σ = 67663624896. Its totient is φ = 5382144000.

The previous prime is 20745750713. The next prime is 20745750787. The reversal of 20745750720 is 2705754702.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23654922 + ... + 23655798.

It is an arithmetic number, because the mean of its divisors is an integer number (302069754).

Almost surely, 2^20745750720 is an apocalyptic number.

20745750720 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 20745750720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33831812448).

20745750720 is an abundant number, since it is smaller than the sum of its proper divisors (46917874176).

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

20745750720 is a wasteful number, since it uses less digits than its factorization.

20745750720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 1529 counting only the distinct ones).

The product of its (nonzero) digits is 137200, while the sum is 39.

The spelling of 20745750720 in words is "twenty billion, seven hundred forty-five million, seven hundred fifty thousand, seven hundred twenty".