20656215122 has 16 divisors (see below), whose sum is σ = 31046852760. Its totient is φ = 10307284992.

The previous prime is 20656215121. The next prime is 20656215127. The reversal of 20656215122 is 22151265602.

It can be written as a sum of positive squares in 4 ways, for example, as 13707492241 + 6948722881 = 117079^2 + 83359^2 .

It is not an unprimeable number, because it can be changed into a prime (20656215121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2599868 + ... + 2607800.

Almost surely, 2^20656215122 is an apocalyptic number.

20656215122 is a deficient number, since it is larger than the sum of its proper divisors (10390637638).

20656215122 is a wasteful number, since it uses less digits than its factorization.

20656215122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10397.

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 20656215122 in words is "twenty billion, six hundred fifty-six million, two hundred fifteen thousand, one hundred twenty-two".