20042171518 has 8 divisors (see below), whose sum is σ = 30425465448. Its totient is φ = 9900349704.

The previous prime is 20042171509. The next prime is 20042171519. The reversal of 20042171518 is 81517124002.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20042171518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042171519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60367821 + ... + 60368152.

It is an arithmetic number, because the mean of its divisors is an integer number (3803183181).

Almost surely, 2^20042171518 is an apocalyptic number.

20042171518 is a deficient number, since it is larger than the sum of its proper divisors (10383293930).

20042171518 is a wasteful number, since it uses less digits than its factorization.

20042171518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120736058.

The product of its (nonzero) digits is 4480, while the sum is 31.

The spelling of 20042171518 in words is "twenty billion, forty-two million, one hundred seventy-one thousand, five hundred eighteen".