20108513645 has 16 divisors (see below), whose sum is σ = 26380760832. Its totient is φ = 14592768960.

The previous prime is 20108513641. The next prime is 20108513647. The reversal of 20108513645 is 54631580102.

It is not a de Polignac number, because 20108513645 - 2² = 20108513641 is a prime.

It is a super-3 number, since 3×20108513645³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20108513641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369362 + ... + 420291.

It is an arithmetic number, because the mean of its divisors is an integer number (1648797552).

Almost surely, 2^20108513645 is an apocalyptic number.

It is an amenable number.

20108513645 is a deficient number, since it is larger than the sum of its proper divisors (6272247187).

20108513645 is a wasteful number, since it uses less digits than its factorization.

20108513645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790132.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 20108513645 in words is "twenty billion, one hundred eight million, five hundred thirteen thousand, six hundred forty-five".