20123243320 has 16 divisors (see below), whose sum is σ = 45277297560. Its totient is φ = 8049297312.

The previous prime is 20123243303. The next prime is 20123243351. The reversal of 20123243320 is 2334232102.

It is a junction number, because it is equal to n+sod(n) for n = 20123243291 and 20123243300.

It is a congruent number.

It is an unprimeable number.

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, 251540502 + ... + 251540581.

Almost surely, 2^20123243320 is an apocalyptic number.

20123243320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20123243320 is an abundant number, since it is smaller than the sum of its proper divisors (25154054240).

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

20123243320 is a wasteful number, since it uses less digits than its factorization.

20123243320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503081094 (or 503081090 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20123243320 its reverse (2334232102), we get a palindrome (22457475422).

The spelling of 20123243320 in words is "twenty billion, one hundred twenty-three million, two hundred forty-three thousand, three hundred twenty".