20051555323 has 4 divisors (see below), whose sum is σ = 21106900360. Its totient is φ = 18996210288.

The previous prime is 20051555311. The next prime is 20051555413. The reversal of 20051555323 is 32355515002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20051555323 - 2⁹ = 20051554811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20051555423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527672490 + ... + 527672527.

It is an arithmetic number, because the mean of its divisors is an integer number (5276725090).

Almost surely, 2^20051555323 is an apocalyptic number.

20051555323 is a deficient number, since it is larger than the sum of its proper divisors (1055345037).

20051555323 is a wasteful number, since it uses less digits than its factorization.

20051555323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055345036.

The product of its (nonzero) digits is 22500, while the sum is 31.

The spelling of 20051555323 in words is "twenty billion, fifty-one million, five hundred fifty-five thousand, three hundred twenty-three".