20423445404208 has 160 divisors (see below), whose sum is σ = 69648785763840. Its totient is φ = 4992744468480.

The previous prime is 20423445404207. The next prime is 20423445404231. The reversal of 20423445404208 is 80240454432402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 20423445404208.

It is not an unprimeable number, because it can be changed into a prime (20423445404203) 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 31 ways as a sum of consecutive naturals, for example, 162461403 + ... + 162587066.

It is an arithmetic number, because the mean of its divisors is an integer number (435304911024).

Almost surely, 2^{20423445404208} is an apocalyptic number.

20423445404208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20423445404208 is an abundant number, since it is smaller than the sum of its proper divisors (49225340359632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20423445404208 is a wasteful number, since it uses less digits than its factorization.

20423445404208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325048515 (or 325048509 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 42.

The spelling of 20423445404208 in words is "twenty trillion, four hundred twenty-three billion, four hundred forty-five million, four hundred four thousand, two hundred eight".