20315251640534 has 16 divisors (see below), whose sum is σ = 31899375567072. Its totient is φ = 9684948406848.

The previous prime is 20315251640533. The next prime is 20315251640611. The reversal of 20315251640534 is 43504615251302.

It is a junction number, because it is equal to n+sod(n) for n = 20315251640491 and 20315251640500.

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 7 ways as a sum of consecutive naturals, for example, 705474269 + ... + 705503064.

It is an arithmetic number, because the mean of its divisors is an integer number (1993710972942).

Almost surely, 2^{20315251640534} is an apocalyptic number.

20315251640534 is a deficient number, since it is larger than the sum of its proper divisors (11584123926538).

20315251640534 is a wasteful number, since it uses less digits than its factorization.

20315251640534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410977671.

The product of its (nonzero) digits is 432000, while the sum is 41.

Adding to 20315251640534 its reverse (43504615251302), we get a palindrome (63819866891836).

The spelling of 20315251640534 in words is "twenty trillion, three hundred fifteen billion, two hundred fifty-one million, six hundred forty thousand, five hundred thirty-four".