20405212323 has 8 divisors (see below), whose sum is σ = 27213511248. Its totient is φ = 13600194144.

The previous prime is 20405212309. The next prime is 20405212351. The reversal of 20405212323 is 32321250402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20405212323 - 2⁴ = 20405212307 is a prime.

It is a super-2 number, since 2×20405212323² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20405212293 and 20405212302.

It is not an unprimeable number, because it can be changed into a prime (20405212423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 805636 + ... + 830577.

It is an arithmetic number, because the mean of its divisors is an integer number (3401688906).

Almost surely, 2^20405212323 is an apocalyptic number.

20405212323 is a deficient number, since it is larger than the sum of its proper divisors (6808298925).

20405212323 is a wasteful number, since it uses less digits than its factorization.

20405212323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640373.

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 20405212323 its reverse (32321250402), we get a palindrome (52726462725).

The spelling of 20405212323 in words is "twenty billion, four hundred five million, two hundred twelve thousand, three hundred twenty-three".