20489018 has 8 divisors (see below), whose sum is σ = 33527520. Its totient is φ = 9313180.

The previous prime is 20489003. The next prime is 20489023. The reversal of 20489018 is 81098402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465638 + ... + 465681.

It is an arithmetic number, because the mean of its divisors is an integer number (4190940).

Almost surely, 2^20489018 is an apocalyptic number.

20489018 is a deficient number, since it is larger than the sum of its proper divisors (13038502).

20489018 is a wasteful number, since it uses less digits than its factorization.

20489018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931332.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20489018 is about 4526.4796475849. The cubic root of 20489018 is about 273.6363032918.

The spelling of 20489018 in words is "twenty million, four hundred eighty-nine thousand, eighteen".