20116428780 has 432 divisors, whose sum is σ = 70877802240. Its totient is φ = 4173950976.

The previous prime is 20116428757. The next prime is 20116428821. The reversal of 20116428780 is 8782461102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 340956391 + ... + 340956449.

Almost surely, 2^20116428780 is an apocalyptic number.

20116428780 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 20116428780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35438901120).

20116428780 is an abundant number, since it is smaller than the sum of its proper divisors (50761373460).

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

20116428780 is a wasteful number, since it uses less digits than its factorization.

20116428780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

Adding to 20116428780 its reverse (8782461102), we get a palindrome (28898889882).

The spelling of 20116428780 in words is "twenty billion, one hundred sixteen million, four hundred twenty-eight thousand, seven hundred eighty".