20021122158 has 16 divisors (see below), whose sum is σ = 40044458496. Its totient is φ = 6673338360.

The previous prime is 20021122157. The next prime is 20021122159. The reversal of 20021122158 is 85122112002.

It is an interprime number because it is at equal distance from previous prime (20021122157) and next prime (20021122159).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021122157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39843 + ... + 204033.

It is an arithmetic number, because the mean of its divisors is an integer number (2502778656).

Almost surely, 2^20021122158 is an apocalyptic number.

20021122158 is an abundant number, since it is smaller than the sum of its proper divisors (20023336338).

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

20021122158 is a wasteful number, since it uses less digits than its factorization.

20021122158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184519.

The product of its (nonzero) digits is 640, while the sum is 24.

The spelling of 20021122158 in words is "twenty billion, twenty-one million, one hundred twenty-two thousand, one hundred fifty-eight".