20451105423545 has 32 divisors (see below), whose sum is σ = 26014194493056. Its totient is φ = 15381144345600.

The previous prime is 20451105423431. The next prime is 20451105423569. The reversal of 20451105423545 is 54532450115402.

It is a happy number.

It is not a de Polignac number, because 20451105423545 - 2⁸ = 20451105423289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 813249662 + ... + 813274808.

It is an arithmetic number, because the mean of its divisors is an integer number (812943577908).

Almost surely, 2^{20451105423545} is an apocalyptic number.

It is an amenable number.

20451105423545 is a deficient number, since it is larger than the sum of its proper divisors (5563089069511).

20451105423545 is a wasteful number, since it uses less digits than its factorization.

20451105423545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35561.

The product of its (nonzero) digits is 480000, while the sum is 41.

Adding to 20451105423545 its reverse (54532450115402), we get a palindrome (74983555538947).

The spelling of 20451105423545 in words is "twenty trillion, four hundred fifty-one billion, one hundred five million, four hundred twenty-three thousand, five hundred forty-five".