20011619850 has 144 divisors (see below), whose sum is σ = 52911390240. Its totient is φ = 5004144000.

The previous prime is 20011619843. The next prime is 20011619851. The reversal of 20011619850 is 5891611002.

It is not an unprimeable number, because it can be changed into a prime (20011619851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5467321 + ... + 5470979.

It is an arithmetic number, because the mean of its divisors is an integer number (367440210).

Almost surely, 2^20011619850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20011619850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26455695120).

20011619850 is an abundant number, since it is smaller than the sum of its proper divisors (32899770390).

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

20011619850 is a wasteful number, since it uses less digits than its factorization.

20011619850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3813 (or 3789 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 33.

The spelling of 20011619850 in words is "twenty billion, eleven million, six hundred nineteen thousand, eight hundred fifty".