20420431340042 has 8 divisors (see below), whose sum is σ = 31342987638336. Its totient is φ = 9972768793932.

The previous prime is 20420431339967. The next prime is 20420431340053. The reversal of 20420431340042 is 24004313402402.

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

It is a super-2 number, since 2×20420431340042² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20420431339987 and 20420431340014.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118723437938 + ... + 118723438109.

It is an arithmetic number, because the mean of its divisors is an integer number (3917873454792).

Almost surely, 2^{20420431340042} is an apocalyptic number.

20420431340042 is a deficient number, since it is larger than the sum of its proper divisors (10922556298294).

20420431340042 is a wasteful number, since it uses less digits than its factorization.

20420431340042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237446876092.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 20420431340042 its reverse (24004313402402), we get a palindrome (44424744742444).

The spelling of 20420431340042 in words is "twenty trillion, four hundred twenty billion, four hundred thirty-one million, three hundred forty thousand, forty-two".