20972907842828 has 12 divisors (see below), whose sum is σ = 37205363913480. Its totient is φ = 10342803867552.

The previous prime is 20972907842827. The next prime is 20972907842833. The reversal of 20972907842828 is 82824870927902.

It is not an unprimeable number, because it can be changed into a prime (20972907842827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35912513138 + ... + 35912513721.

It is an arithmetic number, because the mean of its divisors is an integer number (3100446992790).

Almost surely, 2^{20972907842828} is an apocalyptic number.

It is an amenable number.

20972907842828 is a deficient number, since it is larger than the sum of its proper divisors (16232456070652).

20972907842828 is a wasteful number, since it uses less digits than its factorization.

20972907842828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71825026936 (or 71825026934 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 68.

The spelling of 20972907842828 in words is "twenty trillion, nine hundred seventy-two billion, nine hundred seven million, eight hundred forty-two thousand, eight hundred twenty-eight".