20001661122 has 16 divisors (see below), whose sum is σ = 40024657152. Its totient is φ = 6663664560.

The previous prime is 20001661111. The next prime is 20001661123. The reversal of 20001661122 is 22116610002.

It is not an unprimeable number, because it can be changed into a prime (20001661123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 876754 + ... + 899277.

It is an arithmetic number, because the mean of its divisors is an integer number (2501541072).

Almost surely, 2^20001661122 is an apocalyptic number.

20001661122 is an abundant number, since it is smaller than the sum of its proper divisors (20022996030).

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

20001661122 is a wasteful number, since it uses less digits than its factorization.

20001661122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777913.

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 20001661122 in words is "twenty billion, one million, six hundred sixty-one thousand, one hundred twenty-two".