20011918680 has 288 divisors, whose sum is σ = 71173589760. Its totient is φ = 4873789440.

The previous prime is 20011918649. The next prime is 20011918697. The reversal of 20011918680 is 8681911002.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5899785 + ... + 5903175.

It is an arithmetic number, because the mean of its divisors is an integer number (247130520).

Almost surely, 2^20011918680 is an apocalyptic number.

20011918680 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 20011918680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35586794880).

20011918680 is an abundant number, since it is smaller than the sum of its proper divisors (51161671080).

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

20011918680 is a wasteful number, since it uses less digits than its factorization.

20011918680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3531 (or 3511 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 20011918680 in words is "twenty billion, eleven million, nine hundred eighteen thousand, six hundred eighty".