20402331123 has 8 divisors (see below), whose sum is σ = 27339808000. Its totient is φ = 13533204168.

The previous prime is 20402331113. The next prime is 20402331151. The reversal of 20402331123 is 32113320402.

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

It is not a de Polignac number, because 20402331123 - 2⁴ = 20402331107 is a prime.

It is a super-2 number, since 2×20402331123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20402331123.

It is not an unprimeable number, because it can be changed into a prime (20402331113) 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 7 ways as a sum of consecutive naturals, for example, 17086783 + ... + 17087976.

It is an arithmetic number, because the mean of its divisors is an integer number (3417476000).

Almost surely, 2^20402331123 is an apocalyptic number.

20402331123 is a deficient number, since it is larger than the sum of its proper divisors (6937476877).

20402331123 is a wasteful number, since it uses less digits than its factorization.

20402331123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34174961.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20402331123 its reverse (32113320402), we get a palindrome (52515651525).

The spelling of 20402331123 in words is "twenty billion, four hundred two million, three hundred thirty-one thousand, one hundred twenty-three".