20315334521531 has 16 divisors (see below), whose sum is σ = 23260051399680. Its totient is φ = 17381268558720.

The previous prime is 20315334521497. The next prime is 20315334521557. The reversal of 20315334521531 is 13512543351302.

It is a cyclic number.

It is not a de Polignac number, because 20315334521531 - 2⁶ = 20315334521467 is a prime.

It is a super-2 number, since 2×20315334521531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20315334521431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11814830 + ... + 13424636.

It is an arithmetic number, because the mean of its divisors is an integer number (1453753212480).

Almost surely, 2^{20315334521531} is an apocalyptic number.

20315334521531 is a deficient number, since it is larger than the sum of its proper divisors (2944716878149).

20315334521531 is a wasteful number, since it uses less digits than its factorization.

20315334521531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613114.

The product of its (nonzero) digits is 162000, while the sum is 38.

Adding to 20315334521531 its reverse (13512543351302), we get a palindrome (33827877872833).

The spelling of 20315334521531 in words is "twenty trillion, three hundred fifteen billion, three hundred thirty-four million, five hundred twenty-one thousand, five hundred thirty-one".