20489884 has 24 divisors (see below), whose sum is σ = 37296000. Its totient is φ = 9839040.

The previous prime is 20489881. The next prime is 20489891. The reversal of 20489884 is 48898402.

It is a self number, because there is not a number n which added to its sum of digits gives 20489884.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17922 + ... + 19030.

It is an arithmetic number, because the mean of its divisors is an integer number (1554000).

Almost surely, 2^20489884 is an apocalyptic number.

It is an amenable number.

20489884 is a deficient number, since it is larger than the sum of its proper divisors (16806116).

20489884 is a wasteful number, since it uses less digits than its factorization.

20489884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293 (or 1291 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 43.

The square root of 20489884 is about 4526.5753059018. The cubic root of 20489884 is about 273.6401584579.

The spelling of 20489884 in words is "twenty million, four hundred eighty-nine thousand, eight hundred eighty-four".