20287418 has 4 divisors (see below), whose sum is σ = 30431130. Its totient is φ = 10143708.

The previous prime is 20287417. The next prime is 20287429. The reversal of 20287418 is 81478202.

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., 13227769 + 7059649 = 3637^2 + 2657^2 .

It is not an unprimeable number, because it can be changed into a prime (20287411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5071853 + ... + 5071856.

Almost surely, 2^20287418 is an apocalyptic number.

20287418 is a deficient number, since it is larger than the sum of its proper divisors (10143712).

20287418 is a wasteful number, since it uses less digits than its factorization.

20287418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10143711.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 20287418 is about 4504.1556367426. The cubic root of 20287418 is about 272.7358696213.

The spelling of 20287418 in words is "twenty million, two hundred eighty-seven thousand, four hundred eighteen".