20723471436845 has 8 divisors (see below), whose sum is σ = 24872495928576. Its totient is φ = 16575890346576.

The previous prime is 20723471436839. The next prime is 20723471436853. The reversal of 20723471436845 is 54863417432702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20723471436845 - 2¹⁸ = 20723471174701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360818777 + ... + 360876206.

It is an arithmetic number, because the mean of its divisors is an integer number (3109061991072).

Almost surely, 2^{20723471436845} is an apocalyptic number.

It is an amenable number.

20723471436845 is a deficient number, since it is larger than the sum of its proper divisors (4149024491731).

20723471436845 is an equidigital number, since it uses as much as digits as its factorization.

20723471436845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721700731.

The product of its (nonzero) digits is 27095040, while the sum is 56.

The spelling of 20723471436845 in words is "twenty trillion, seven hundred twenty-three billion, four hundred seventy-one million, four hundred thirty-six thousand, eight hundred forty-five".