20018473 has 4 divisors (see below), whose sum is σ = 20029840. Its totient is φ = 20007108.

The previous prime is 20018459. The next prime is 20018477. The reversal of 20018473 is 37481002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20018473 - 2¹³ = 20010281 is a prime.

It is a super-2 number, since 2×20018473² = 801478522503458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20018477) 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, 2415 + ... + 6772.

It is an arithmetic number, because the mean of its divisors is an integer number (5007460).

Almost surely, 2^20018473 is an apocalyptic number.

It is an amenable number.

20018473 is a deficient number, since it is larger than the sum of its proper divisors (11367).

20018473 is an equidigital number, since it uses as much as digits as its factorization.

20018473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11366.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20018473 is about 4474.2008224933. The cubic root of 20018473 is about 271.5253083365.

Adding to 20018473 its reverse (37481002), we get a palindrome (57499475).

The spelling of 20018473 in words is "twenty million, eighteen thousand, four hundred seventy-three".