20489913 has 24 divisors (see below), whose sum is σ = 31574088. Its totient is φ = 12759552.

The previous prime is 20489899. The next prime is 20489927. The reversal of 20489913 is 31998402.

It is an interprime number because it is at equal distance from previous prime (20489899) and next prime (20489927).

It can be written as a sum of positive squares in 4 ways, for example, as 535824 + 19954089 = 732^2 + 4467^2 .

It is not a de Polignac number, because 20489913 - 2⁵ = 20489881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20489813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23595 + ... + 24447.

It is an arithmetic number, because the mean of its divisors is an integer number (1315587).

Almost surely, 2^20489913 is an apocalyptic number.

It is an amenable number.

20489913 is a deficient number, since it is larger than the sum of its proper divisors (11084175).

20489913 is a wasteful number, since it uses less digits than its factorization.

20489913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033 (or 1030 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20489913 is about 4526.5785092054. The cubic root of 20489913 is about 273.6402875551.

The spelling of 20489913 in words is "twenty million, four hundred eighty-nine thousand, nine hundred thirteen".