20315251640536 has 16 divisors (see below), whose sum is σ = 38093284094040. Its totient is φ = 10157042548800.

The previous prime is 20315251640533. The next prime is 20315251640611. The reversal of 20315251640536 is 63504615251302.

It is a junction number, because it is equal to n+sod(n) for n = 20315251640492 and 20315251640501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315251640533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72760890 + ... + 73039561.

Almost surely, 2^{20315251640536} is an apocalyptic number.

It is an amenable number.

20315251640536 is a deficient number, since it is larger than the sum of its proper divisors (17778032453504).

20315251640536 is a wasteful number, since it uses less digits than its factorization.

20315251640536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145817874 (or 145817870 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 43.

Adding to 20315251640536 its reverse (63504615251302), we get a palindrome (83819866891838).

The spelling of 20315251640536 in words is "twenty trillion, three hundred fifteen billion, two hundred fifty-one million, six hundred forty thousand, five hundred thirty-six".