20445012323205 has 32 divisors (see below), whose sum is σ = 33777337540608. Its totient is φ = 10549110868800.

The previous prime is 20445012323201. The next prime is 20445012323221. The reversal of 20445012323205 is 50232321054402.

It is not a de Polignac number, because 20445012323205 - 2² = 20445012323201 is a prime.

It is a super-2 number, since 2×20445012323205² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445012323201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5011881 + ... + 8124590.

It is an arithmetic number, because the mean of its divisors is an integer number (1055541798144).

Almost surely, 2^{20445012323205} is an apocalyptic number.

It is an amenable number.

20445012323205 is a deficient number, since it is larger than the sum of its proper divisors (13332325217403).

20445012323205 is a wasteful number, since it uses less digits than its factorization.

20445012323205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13139857.

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 20445012323205 its reverse (50232321054402), we get a palindrome (70677333377607).

The spelling of 20445012323205 in words is "twenty trillion, four hundred forty-five billion, twelve million, three hundred twenty-three thousand, two hundred five".