20135611680 has 192 divisors, whose sum is σ = 65383210368. Its totient is φ = 5205565440.

The previous prime is 20135611669. The next prime is 20135611697. The reversal of 20135611680 is 8611653102.

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, 3204702 + ... + 3210978.

It is an arithmetic number, because the mean of its divisors is an integer number (340537554).

Almost surely, 2^20135611680 is an apocalyptic number.

20135611680 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 20135611680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32691605184).

20135611680 is an abundant number, since it is smaller than the sum of its proper divisors (45247598688).

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

20135611680 is a wasteful number, since it uses less digits than its factorization.

20135611680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6499 (or 6491 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 20135611680 in words is "twenty billion, one hundred thirty-five million, six hundred eleven thousand, six hundred eighty".