20439170 has 24 divisors (see below), whose sum is σ = 37837044. Its totient is φ = 7949376.

The previous prime is 20439169. The next prime is 20439173. The reversal of 20439170 is 7193402.

It can be written as a sum of positive squares in 6 ways, for example, as 19704721 + 734449 = 4439^2 + 857^2 .

It is not an unprimeable number, because it can be changed into a prime (20439173) 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 11 ways as a sum of consecutive naturals, for example, 12944 + ... + 14436.

Almost surely, 2^20439170 is an apocalyptic number.

20439170 is a deficient number, since it is larger than the sum of its proper divisors (17397874).

20439170 is a wasteful number, since it uses less digits than its factorization.

20439170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574 (or 1537 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20439170 is about 4520.9700286554. The cubic root of 20439170 is about 273.4142119704.

The spelling of 20439170 in words is "twenty million, four hundred thirty-nine thousand, one hundred seventy".