20489756 has 48 divisors (see below), whose sum is σ = 42470400. Its totient is φ = 8468928.

The previous prime is 20489753. The next prime is 20489759. The reversal of 20489756 is 65798402.

It is an interprime number because it is at equal distance from previous prime (20489753) and next prime (20489759).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130430 + ... + 130586.

It is an arithmetic number, because the mean of its divisors is an integer number (884800).

Almost surely, 2^20489756 is an apocalyptic number.

It is an amenable number.

20489756 is an abundant number, since it is smaller than the sum of its proper divisors (21980644).

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

20489756 is a wasteful number, since it uses less digits than its factorization.

20489756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 20489756 is about 4526.5611671555. The cubic root of 20489756 is about 273.6395886480.

The spelling of 20489756 in words is "twenty million, four hundred eighty-nine thousand, seven hundred fifty-six".