20940336740 has 12 divisors (see below), whose sum is σ = 43974707196. Its totient is φ = 8376134688.

The previous prime is 20940336731. The next prime is 20940336743. The reversal of 20940336740 is 4763304902.

It can be written as a sum of positive squares in 2 ways, for example, as 2254540324 + 18685796416 = 47482^2 + 136696^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20940336694 and 20940336703.

It is not an unprimeable number, because it can be changed into a prime (20940336743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523508399 + ... + 523508438.

It is an arithmetic number, because the mean of its divisors is an integer number (3664558933).

Almost surely, 2^20940336740 is an apocalyptic number.

20940336740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20940336740 is an abundant number, since it is smaller than the sum of its proper divisors (23034370456).

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

20940336740 is a wasteful number, since it uses less digits than its factorization.

20940336740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047016846 (or 1047016844 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 38.

The spelling of 20940336740 in words is "twenty billion, nine hundred forty million, three hundred thirty-six thousand, seven hundred forty".