20669706156 has 96 divisors (see below), whose sum is σ = 56260915200. Its totient is φ = 5836672000.

The previous prime is 20669706137. The next prime is 20669706199. The reversal of 20669706156 is 65160796602.

It is a super-3 number, since 3×20669706156³ (a number of 32 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181045 + ... + 272243.

It is an arithmetic number, because the mean of its divisors is an integer number (586051200).

Almost surely, 2^20669706156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20669706156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28130457600).

20669706156 is an abundant number, since it is smaller than the sum of its proper divisors (35591209044).

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

20669706156 is a wasteful number, since it uses less digits than its factorization.

20669706156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91335 (or 91333 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 48.

The spelling of 20669706156 in words is "twenty billion, six hundred sixty-nine million, seven hundred six thousand, one hundred fifty-six".