20315251640535 has 32 divisors (see below), whose sum is σ = 32539808747520. Its totient is φ = 10823000601600.

The previous prime is 20315251640533. The next prime is 20315251640611. The reversal of 20315251640535 is 53504615251302.

It is not a de Polignac number, because 20315251640535 - 2¹ = 20315251640533 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 213547630 + ... + 213642740.

It is an arithmetic number, because the mean of its divisors is an integer number (1016869023360).

Almost surely, 2^{20315251640535} is an apocalyptic number.

20315251640535 is a deficient number, since it is larger than the sum of its proper divisors (12224557106985).

20315251640535 is a wasteful number, since it uses less digits than its factorization.

20315251640535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110479.

The product of its (nonzero) digits is 540000, while the sum is 42.

Adding to 20315251640535 its reverse (53504615251302), we get a palindrome (73819866891837).

The spelling of 20315251640535 in words is "twenty trillion, three hundred fifteen billion, two hundred fifty-one million, six hundred forty thousand, five hundred thirty-five".