20123400242 has 32 divisors (see below), whose sum is σ = 34894722240. Its totient is φ = 8601902080.

The previous prime is 20123400239. The next prime is 20123400263. The reversal of 20123400242 is 24200432102.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449498 + ... + 492234.

It is an arithmetic number, because the mean of its divisors is an integer number (1090460070).

Almost surely, 2^20123400242 is an apocalyptic number.

20123400242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20123400242 is a deficient number, since it is larger than the sum of its proper divisors (14771321998).

20123400242 is a wasteful number, since it uses less digits than its factorization.

20123400242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44026.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20123400242 its reverse (24200432102), we get a palindrome (44323832344).

The spelling of 20123400242 in words is "twenty billion, one hundred twenty-three million, four hundred thousand, two hundred forty-two".