20648018 has 4 divisors (see below), whose sum is σ = 30972030. Its totient is φ = 10324008.

The previous prime is 20648011. The next prime is 20648021. The reversal of 20648018 is 81084602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81084602 = 2 ⋅40542301.

It can be written as a sum of positive squares in only one way, i.e., 11785489 + 8862529 = 3433^2 + 2977^2 .

It is not an unprimeable number, because it can be changed into a prime (20648011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5162003 + ... + 5162006.

Almost surely, 2^20648018 is an apocalyptic number.

20648018 is a deficient number, since it is larger than the sum of its proper divisors (10324012).

20648018 is a wasteful number, since it uses less digits than its factorization.

20648018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10324011.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20648018 is about 4544.0090228784. The cubic root of 20648018 is about 274.3423093110.

The spelling of 20648018 in words is "twenty million, six hundred forty-eight thousand, eighteen".