20340442123 has 16 divisors (see below), whose sum is σ = 21073067200. Its totient is φ = 19618194816.

The previous prime is 20340442121. The next prime is 20340442139. The reversal of 20340442123 is 32124404302.

It is a happy number.

It is not a de Polignac number, because 20340442123 - 2¹ = 20340442121 is a prime.

It is a super-2 number, since 2×20340442123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20340442121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2034565 + ... + 2044537.

It is an arithmetic number, because the mean of its divisors is an integer number (1317066700).

Almost surely, 2^20340442123 is an apocalyptic number.

20340442123 is a deficient number, since it is larger than the sum of its proper divisors (732625077).

20340442123 is a wasteful number, since it uses less digits than its factorization.

20340442123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10486.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 20340442123 its reverse (32124404302), we get a palindrome (52464846425).

The spelling of 20340442123 in words is "twenty billion, three hundred forty million, four hundred forty-two thousand, one hundred twenty-three".