20016155514640 has 40 divisors (see below), whose sum is σ = 47060455538520. Its totient is φ = 7916501953536.

The previous prime is 20016155514601. The next prime is 20016155514661. The reversal of 20016155514640 is 4641555161002.

It can be written as a sum of positive squares in 4 ways, for example, as 4707372443904 + 15308783070736 = 2169648^2 + 3912644^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 20016155514593 and 20016155514602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1405621779 + ... + 1405636018.

It is an arithmetic number, because the mean of its divisors is an integer number (1176511388463).

Almost surely, 2^{20016155514640} is an apocalyptic number.

20016155514640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20016155514640 is an abundant number, since it is smaller than the sum of its proper divisors (27044300023880).

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

20016155514640 is a wasteful number, since it uses less digits than its factorization.

20016155514640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811257899 (or 2811257893 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 20016155514640 in words is "twenty trillion, sixteen billion, one hundred fifty-five million, five hundred fourteen thousand, six hundred forty".