20012211018 has 48 divisors (see below), whose sum is σ = 44925683400. Its totient is φ = 6430556160.

The previous prime is 20012211007. The next prime is 20012211019. The reversal of 20012211018 is 81011221002.

It can be written as a sum of positive squares in 4 ways, for example, as 19956365289 + 55845729 = 141267^2 + 7473^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20012211019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 304698 + ... + 364506.

Almost surely, 2^20012211018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20012211018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22462841700).

20012211018 is an abundant number, since it is smaller than the sum of its proper divisors (24913472382).

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

20012211018 is a wasteful number, since it uses less digits than its factorization.

20012211018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60487 (or 60484 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The spelling of 20012211018 in words is "twenty billion, twelve million, two hundred eleven thousand, eighteen".