20345375671 has 4 divisors (see below), whose sum is σ = 21001678144. Its totient is φ = 19689073200.

The previous prime is 20345375669. The next prime is 20345375681. The reversal of 20345375671 is 17657354302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20345375671 - 2¹ = 20345375669 is a prime.

It is a super-2 number, since 2×20345375671² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345375621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328151190 + ... + 328151251.

It is an arithmetic number, because the mean of its divisors is an integer number (5250419536).

Almost surely, 2^20345375671 is an apocalyptic number.

20345375671 is a deficient number, since it is larger than the sum of its proper divisors (656302473).

20345375671 is an equidigital number, since it uses as much as digits as its factorization.

20345375671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656302472.

The product of its (nonzero) digits is 529200, while the sum is 43.

The spelling of 20345375671 in words is "twenty billion, three hundred forty-five million, three hundred seventy-five thousand, six hundred seventy-one".