20418471 has 6 divisors (see below), whose sum is σ = 29493360. Its totient is φ = 13612308.

The previous prime is 20418467. The next prime is 20418481. The reversal of 20418471 is 17481402.

It is not a de Polignac number, because 20418471 - 2² = 20418467 is a prime.

It is a super-3 number, since 3×20418471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20418401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1134351 + ... + 1134368.

It is an arithmetic number, because the mean of its divisors is an integer number (4915560).

Almost surely, 2^20418471 is an apocalyptic number.

20418471 is a deficient number, since it is larger than the sum of its proper divisors (9074889).

20418471 is a wasteful number, since it uses less digits than its factorization.

20418471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2268725 (or 2268722 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 20418471 is about 4518.6802276771. The cubic root of 20418471 is about 273.3218841460.

Adding to 20418471 its reverse (17481402), we get a palindrome (37899873).

The spelling of 20418471 in words is "twenty million, four hundred eighteen thousand, four hundred seventy-one".