20491906312 has 16 divisors (see below), whose sum is σ = 38634605100. Its totient is φ = 10189344960.

The previous prime is 20491906307. The next prime is 20491906397. The reversal of 20491906312 is 21360919402.

It can be written as a sum of positive squares in 2 ways, for example, as 16097011876 + 4394894436 = 126874^2 + 66294^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7074487 + ... + 7077382.

Almost surely, 2^20491906312 is an apocalyptic number.

It is an amenable number.

20491906312 is a deficient number, since it is larger than the sum of its proper divisors (18142698788).

20491906312 is a wasteful number, since it uses less digits than its factorization.

20491906312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14152056 (or 14152052 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

It can be divided in two parts, 2049190 and 6312, that added together give a palindrome (2055502).

The spelling of 20491906312 in words is "twenty billion, four hundred ninety-one million, nine hundred six thousand, three hundred twelve".