20445945125205 has 16 divisors (see below), whose sum is σ = 33474291554880. Its totient is φ = 10650910948608.

The previous prime is 20445945125147. The next prime is 20445945125231. The reversal of 20445945125205 is 50252154954402.

It is not a de Polignac number, because 20445945125205 - 2¹⁶ = 20445945059669 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15849569220 + ... + 15849570509.

It is an arithmetic number, because the mean of its divisors is an integer number (2092143222180).

Almost surely, 2^{20445945125205} is an apocalyptic number.

It is an amenable number.

20445945125205 is a deficient number, since it is larger than the sum of its proper divisors (13028346429675).

20445945125205 is a wasteful number, since it uses less digits than its factorization.

20445945125205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31699139780.

The product of its (nonzero) digits is 2880000, while the sum is 48.

The spelling of 20445945125205 in words is "twenty trillion, four hundred forty-five billion, nine hundred forty-five million, one hundred twenty-five thousand, two hundred five".