20004200042 has 12 divisors (see below), whose sum is σ = 30523512066. Its totient is φ = 9832569480.

The previous prime is 20004200023. The next prime is 20004200057. The reversal of 20004200042 is 24000240002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14643178081 + 5361021961 = 121009^2 + 73219^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1429709 + ... + 1443632.

Almost surely, 2^20004200042 is an apocalyptic number.

20004200042 is a deficient number, since it is larger than the sum of its proper divisors (10519312024).

20004200042 is an equidigital number, since it uses as much as digits as its factorization.

20004200042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873461 (or 2873402 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

Adding to 20004200042 its reverse (24000240002), we get a palindrome (44004440044).

The spelling of 20004200042 in words is "twenty billion, four million, two hundred thousand, forty-two".