20123243402 has 8 divisors (see below), whose sum is σ = 30202409412. Its totient is φ = 10055773600.

The previous prime is 20123243377. The next prime is 20123243411. The reversal of 20123243402 is 20434232102.

It can be written as a sum of positive squares in 2 ways, for example, as 19813096081 + 310147321 = 140759^2 + 17611^2 .

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

It is a super-2 number, since 2×20123243402² (a number of 21 digits) contains 22 as substring.

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, 2919749 + ... + 2926632.

Almost surely, 2^20123243402 is an apocalyptic number.

20123243402 is a deficient number, since it is larger than the sum of its proper divisors (10079166010).

20123243402 is a wasteful number, since it uses less digits than its factorization.

20123243402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5848104.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20123243402 its reverse (20434232102), we get a palindrome (40557475504).

The spelling of 20123243402 in words is "twenty billion, one hundred twenty-three million, two hundred forty-three thousand, four hundred two".