20489240 has 32 divisors (see below), whose sum is σ = 46327680. Its totient is φ = 8155392.

The previous prime is 20489237. The next prime is 20489257. The reversal of 20489240 is 4298402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7772 + ... + 10068.

It is an arithmetic number, because the mean of its divisors is an integer number (1447740).

Almost surely, 2^20489240 is an apocalyptic number.

20489240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20489240 is an abundant number, since it is smaller than the sum of its proper divisors (25838440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20489240 is a wasteful number, since it uses less digits than its factorization.

20489240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531 (or 2527 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20489240 is about 4526.5041698865. The cubic root of 20489240 is about 273.6372915780.

The spelling of 20489240 in words is "twenty million, four hundred eighty-nine thousand, two hundred forty".