20431534323215 has 32 divisors (see below), whose sum is σ = 25358371923456. Its totient is φ = 15793393714560.

The previous prime is 20431534323133. The next prime is 20431534323217. The reversal of 20431534323215 is 51232343513402.

It is not a de Polignac number, because 20431534323215 - 2³⁴ = 20414354454031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431534323217) 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, 20484185 + ... + 21458445.

It is an arithmetic number, because the mean of its divisors is an integer number (792449122608).

Almost surely, 2^{20431534323215} is an apocalyptic number.

20431534323215 is a deficient number, since it is larger than the sum of its proper divisors (4926837600241).

20431534323215 is a wasteful number, since it uses less digits than its factorization.

20431534323215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975359.

The product of its (nonzero) digits is 259200, while the sum is 38.

Adding to 20431534323215 its reverse (51232343513402), we get a palindrome (71663877836617).

The spelling of 20431534323215 in words is "twenty trillion, four hundred thirty-one billion, five hundred thirty-four million, three hundred twenty-three thousand, two hundred fifteen".