20742421718 has 32 divisors (see below), whose sum is σ = 34059294720. Its totient is φ = 9431614080.

The previous prime is 20742421717. The next prime is 20742421747. The reversal of 20742421718 is 81712424702.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742421717) 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 15 ways as a sum of consecutive naturals, for example, 679655 + ... + 709517.

It is an arithmetic number, because the mean of its divisors is an integer number (1064352960).

Almost surely, 2^20742421718 is an apocalyptic number.

20742421718 is a deficient number, since it is larger than the sum of its proper divisors (13316873002).

20742421718 is a wasteful number, since it uses less digits than its factorization.

20742421718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30572.

The product of its (nonzero) digits is 50176, while the sum is 38.

The spelling of 20742421718 in words is "twenty billion, seven hundred forty-two million, four hundred twenty-one thousand, seven hundred eighteen".