20673501312605 has 4 divisors (see below), whose sum is σ = 24808201575132. Its totient is φ = 16538801050080.

The previous prime is 20673501312601. The next prime is 20673501312617. The reversal of 20673501312605 is 50621310537602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15518848723609 + 5154652588996 = 3939397^2 + 2270386^2 .

It is not a de Polignac number, because 20673501312605 - 2² = 20673501312601 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 (20673501312601) 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, 2067350131256 + ... + 2067350131265.

It is an arithmetic number, because the mean of its divisors is an integer number (6202050393783).

Almost surely, 2^{20673501312605} is an apocalyptic number.

It is an amenable number.

20673501312605 is a deficient number, since it is larger than the sum of its proper divisors (4134700262527).

20673501312605 is an equidigital number, since it uses as much as digits as its factorization.

20673501312605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4134700262526.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 20673501312605 in words is "twenty trillion, six hundred seventy-three billion, five hundred one million, three hundred twelve thousand, six hundred five".