20720406627865 has 24 divisors (see below), whose sum is σ = 28934121073032. Its totient is φ = 14203305204480.

The previous prime is 20720406627853. The next prime is 20720406627931. The reversal of 20720406627865 is 56872660402702.

It can be written as a sum of positive squares in 4 ways, for example, as 1149126112729 + 19571280515136 = 1071973^2 + 4423944^2 .

It is not a de Polignac number, because 20720406627865 - 2¹¹ = 20720406625817 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 14101066 + ... + 15500995.

It is an arithmetic number, because the mean of its divisors is an integer number (1205588378043).

Almost surely, 2^{20720406627865} is an apocalyptic number.

It is an amenable number.

20720406627865 is a deficient number, since it is larger than the sum of its proper divisors (8213714445167).

20720406627865 is a wasteful number, since it uses less digits than its factorization.

20720406627865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29604937 (or 29604930 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 55.

The spelling of 20720406627865 in words is "twenty trillion, seven hundred twenty billion, four hundred six million, six hundred twenty-seven thousand, eight hundred sixty-five".