20061779680 has 96 divisors (see below), whose sum is σ = 47957966784. Its totient is φ = 7929901056.

The previous prime is 20061779677. The next prime is 20061779701. The reversal of 20061779680 is 8697716002.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20061779680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10167174 + ... + 10169146.

It is an arithmetic number, because the mean of its divisors is an integer number (499562154).

Almost surely, 2^20061779680 is an apocalyptic number.

20061779680 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 20061779680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23978983392).

20061779680 is an abundant number, since it is smaller than the sum of its proper divisors (27896187104).

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

20061779680 is a wasteful number, since it uses less digits than its factorization.

20061779680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708 (or 2700 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 20061779680 in words is "twenty billion, sixty-one million, seven hundred seventy-nine thousand, six hundred eighty".