20720646126 has 40 divisors (see below), whose sum is σ = 46449683280. Its totient is φ = 6903893952.

The previous prime is 20720646077. The next prime is 20720646151. The reversal of 20720646126 is 62164602702.

20720646126 is a `hidden beast` number, since 2 + 0 + 7 + 2 + 0 + 646 + 1 + 2 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 365095 + ... + 418013.

It is an arithmetic number, because the mean of its divisors is an integer number (1161242082).

Almost surely, 2^20720646126 is an apocalyptic number.

20720646126 is an abundant number, since it is smaller than the sum of its proper divisors (25729037154).

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

20720646126 is a wasteful number, since it uses less digits than its factorization.

20720646126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55350 (or 55341 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 20720646126 in words is "twenty billion, seven hundred twenty million, six hundred forty-six thousand, one hundred twenty-six".