20420170 has 8 divisors (see below), whose sum is σ = 36756324. Its totient is φ = 8168064.

The previous prime is 20420167. The next prime is 20420207. The reversal of 20420170 is 7102402.

It can be written as a sum of positive squares in 2 ways, for example, as 18173169 + 2247001 = 4263^2 + 1499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1020999 + ... + 1021018.

Almost surely, 2^20420170 is an apocalyptic number.

20420170 is a deficient number, since it is larger than the sum of its proper divisors (16336154).

20420170 is a wasteful number, since it uses less digits than its factorization.

20420170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042024.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 20420170 is about 4518.8682211368. The cubic root of 20420170 is about 273.3294648801.

Adding to 20420170 its reverse (7102402), we get a palindrome (27522572).

The spelling of 20420170 in words is "twenty million, four hundred twenty thousand, one hundred seventy".