20001751680 has 256 divisors, whose sum is σ = 64891290240. Its totient is φ = 5239603200.

The previous prime is 20001751661. The next prime is 20001751739. The reversal of 20001751680 is 8615710002.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 49879480 + ... + 49879880.

Almost surely, 2^20001751680 is an apocalyptic number.

20001751680 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 20001751680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32445645120).

20001751680 is an abundant number, since it is smaller than the sum of its proper divisors (44889538560).

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

20001751680 is a wasteful number, since it uses less digits than its factorization.

20001751680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 807 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The spelling of 20001751680 in words is "twenty billion, one million, seven hundred fifty-one thousand, six hundred eighty".