20155891122 has 96 divisors (see below), whose sum is σ = 46525839360. Its totient is φ = 6536330640.

The previous prime is 20155891103. The next prime is 20155891159. The reversal of 20155891122 is 22119855102.

20155891122 is a `hidden beast` number, since 2 + 0 + 1 + 558 + 91 + 12 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5661579 + ... + 5665137.

It is an arithmetic number, because the mean of its divisors is an integer number (484644160).

Almost surely, 2^20155891122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20155891122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23262919680).

20155891122 is an abundant number, since it is smaller than the sum of its proper divisors (26369948238).

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

20155891122 is a wasteful number, since it uses less digits than its factorization.

20155891122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3890 (or 3878 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The spelling of 20155891122 in words is "twenty billion, one hundred fifty-five million, eight hundred ninety-one thousand, one hundred twenty-two".