20870673145 has 12 divisors (see below), whose sum is σ = 29133756324. Its totient is φ = 14311318560.

The previous prime is 20870673137. The next prime is 20870673149. The reversal of 20870673145 is 54137607802.

It can be written as a sum of positive squares in 2 ways, for example, as 6203767696 + 14666905449 = 78764^2 + 121107^2 .

It is not a de Polignac number, because 20870673145 - 2³ = 20870673137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20870673149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42592966 + ... + 42593455.

It is an arithmetic number, because the mean of its divisors is an integer number (2427813027).

Almost surely, 2^20870673145 is an apocalyptic number.

It is an amenable number.

20870673145 is a deficient number, since it is larger than the sum of its proper divisors (8263083179).

20870673145 is an equidigital number, since it uses as much as digits as its factorization.

20870673145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85186440 (or 85186433 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 20870673145 in words is "twenty billion, eight hundred seventy million, six hundred seventy-three thousand, one hundred forty-five".