20905626323 has 4 divisors (see below), whose sum is σ = 20929302888. Its totient is φ = 20881949760.

The previous prime is 20905626319. The next prime is 20905626341. The reversal of 20905626323 is 32362650902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32362650902 = 2 ⋅16181325451.

It is a cyclic number.

It is not a de Polignac number, because 20905626323 - 2² = 20905626319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20935626323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11836958 + ... + 11838723.

It is an arithmetic number, because the mean of its divisors is an integer number (5232325722).

Almost surely, 2^20905626323 is an apocalyptic number.

20905626323 is a deficient number, since it is larger than the sum of its proper divisors (23676565).

20905626323 is an equidigital number, since it uses as much as digits as its factorization.

20905626323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23676564.

The product of its (nonzero) digits is 116640, while the sum is 38.

The spelling of 20905626323 in words is "twenty billion, nine hundred five million, six hundred twenty-six thousand, three hundred twenty-three".