20423155305505 has 32 divisors (see below), whose sum is σ = 24932487928320. Its totient is φ = 16056589824000.

The previous prime is 20423155305463. The next prime is 20423155305521. The reversal of 20423155305505 is 50550355132402.

It is not a de Polignac number, because 20423155305505 - 2¹¹ = 20423155303457 is a prime.

It is an unprimeable number.

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, 245757001 + ... + 245840089.

It is an arithmetic number, because the mean of its divisors is an integer number (779140247760).

Almost surely, 2^{20423155305505} is an apocalyptic number.

It is an amenable number.

20423155305505 is a deficient number, since it is larger than the sum of its proper divisors (4509332622815).

20423155305505 is an equidigital number, since it uses as much as digits as its factorization.

20423155305505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84889.

The product of its (nonzero) digits is 450000, while the sum is 40.

The spelling of 20423155305505 in words is "twenty trillion, four hundred twenty-three billion, one hundred fifty-five million, three hundred five thousand, five hundred five".