20418489 has 48 divisors (see below), whose sum is σ = 36796032. Its totient is φ = 10623744.

The previous prime is 20418481. The next prime is 20418499. The reversal of 20418489 is 98481402.

It is not a de Polignac number, because 20418489 - 2³ = 20418481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20418481) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87517 + ... + 87749.

It is an arithmetic number, because the mean of its divisors is an integer number (766584).

Almost surely, 2^20418489 is an apocalyptic number.

It is an amenable number.

20418489 is a deficient number, since it is larger than the sum of its proper divisors (16377543).

20418489 is a wasteful number, since it uses less digits than its factorization.

20418489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 20418489 is about 4518.6822194087. The cubic root of 20418489 is about 273.3219644620.

The spelling of 20418489 in words is "twenty million, four hundred eighteen thousand, four hundred eighty-nine".