20312810017 has 4 divisors (see below), whose sum is σ = 20330459136. Its totient is φ = 20295160900.

The previous prime is 20312809991. The next prime is 20312810029. The reversal of 20312810017 is 71001821302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312810017 is a prime.

It is a super-2 number, since 2×20312810017² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20312809973 and 20312810000.

It is not an unprimeable number, because it can be changed into a prime (20312810117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8822833 + ... + 8825134.

It is an arithmetic number, because the mean of its divisors is an integer number (5082614784).

Almost surely, 2^20312810017 is an apocalyptic number.

It is an amenable number.

20312810017 is a deficient number, since it is larger than the sum of its proper divisors (17649119).

20312810017 is a wasteful number, since it uses less digits than its factorization.

20312810017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17649118.

The product of its (nonzero) digits is 672, while the sum is 25.

The spelling of 20312810017 in words is "twenty billion, three hundred twelve million, eight hundred ten thousand, seventeen".