20661206072 has 32 divisors (see below), whose sum is σ = 41732176080. Its totient is φ = 9533099520.

The previous prime is 20661206057. The next prime is 20661206147. The reversal of 20661206072 is 27060216602.

It is a congruent number.

It is an unprimeable number.

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, 343568 + ... + 399200.

Almost surely, 2^20661206072 is an apocalyptic number.

It is an amenable number.

20661206072 is an abundant number, since it is smaller than the sum of its proper divisors (21070970008).

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

20661206072 is a wasteful number, since it uses less digits than its factorization.

20661206072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59223 (or 59219 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The spelling of 20661206072 in words is "twenty billion, six hundred sixty-one million, two hundred six thousand, seventy-two".