20111222178 has 48 divisors (see below), whose sum is σ = 43805656440. Its totient is φ = 6668243712.

The previous prime is 20111222177. The next prime is 20111222179. The reversal of 20111222178 is 87122211102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20111222177) and next prime (20111222179).

It can be written as a sum of positive squares in 4 ways, for example, as 17233650729 + 2877571449 = 131277^2 + 53643^2 .

It is a super-2 number, since 2×20111222178² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20111222177) 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, 2864200 + ... + 2871212.

Almost surely, 2^20111222178 is an apocalyptic number.

20111222178 is an abundant number, since it is smaller than the sum of its proper divisors (23694434262).

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

20111222178 is a wasteful number, since it uses less digits than its factorization.

20111222178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7843 (or 7840 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The spelling of 20111222178 in words is "twenty billion, one hundred eleven million, two hundred twenty-two thousand, one hundred seventy-eight".