20418447 has 16 divisors (see below), whose sum is σ = 31750400. Its totient is φ = 11667096.

The previous prime is 20418439. The next prime is 20418467. The reversal of 20418447 is 74481402.

It is not a de Polignac number, because 20418447 - 2³ = 20418439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20418427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8893 + ... + 10950.

It is an arithmetic number, because the mean of its divisors is an integer number (1984400).

Almost surely, 2^20418447 is an apocalyptic number.

20418447 is a deficient number, since it is larger than the sum of its proper divisors (11331953).

20418447 is an equidigital number, since it uses as much as digits as its factorization.

20418447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19867 (or 19853 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 20418447 is about 4518.6775720337. The cubic root of 20418447 is about 273.3217770579.

Adding to 20418447 its reverse (74481402), we get a palindrome (94899849).

The spelling of 20418447 in words is "twenty million, four hundred eighteen thousand, four hundred forty-seven".