20423445342545 has 8 divisors (see below), whose sum is σ = 28009296469824. Its totient is φ = 14004648234864.

The previous prime is 20423445342541. The next prime is 20423445342551. The reversal of 20423445342545 is 54524354432402.

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

It is not a de Polignac number, because 20423445342545 - 2² = 20423445342541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20423445342545.

It is not an unprimeable number, because it can be changed into a prime (20423445342541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291763504859 + ... + 291763504928.

It is an arithmetic number, because the mean of its divisors is an integer number (3501162058728).

Almost surely, 2^{20423445342545} is an apocalyptic number.

It is an amenable number.

20423445342545 is a deficient number, since it is larger than the sum of its proper divisors (7585851127279).

20423445342545 is an equidigital number, since it uses as much as digits as its factorization.

20423445342545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583527009799.

The product of its (nonzero) digits is 9216000, while the sum is 47.

Adding to 20423445342545 its reverse (54524354432402), we get a palindrome (74947799774947).

The spelling of 20423445342545 in words is "twenty trillion, four hundred twenty-three billion, four hundred forty-five million, three hundred forty-two thousand, five hundred forty-five".