20842018 has 4 divisors (see below), whose sum is σ = 31263030. Its totient is φ = 10421008.

The previous prime is 20842007. The next prime is 20842021. The reversal of 20842018 is 81024802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15000129 + 5841889 = 3873^2 + 2417^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20841983 and 20842001.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5210503 + ... + 5210506.

Almost surely, 2^20842018 is an apocalyptic number.

20842018 is a deficient number, since it is larger than the sum of its proper divisors (10421012).

20842018 is a wasteful number, since it uses less digits than its factorization.

20842018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10421011.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 20842018 is about 4565.3059043179. The cubic root of 20842018 is about 275.1988336129.

The spelling of 20842018 in words is "twenty million, eight hundred forty-two thousand, eighteen".