20520170 has 32 divisors (see below), whose sum is σ = 40715136. Its totient is φ = 7384000.

The previous prime is 20520167. The next prime is 20520179. The reversal of 20520170 is 7102502.

It is not an unprimeable number, because it can be changed into a prime (20520179) 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 15 ways as a sum of consecutive naturals, for example, 10187 + ... + 12033.

It is an arithmetic number, because the mean of its divisors is an integer number (1272348).

Almost surely, 2^20520170 is an apocalyptic number.

20520170 is a deficient number, since it is larger than the sum of its proper divisors (20194966).

20520170 is a wasteful number, since it uses less digits than its factorization.

20520170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 20520170 is about 4529.9194253320. The cubic root of 20520170 is about 273.7749141576.

Adding to 20520170 its reverse (7102502), we get a palindrome (27622672).

The spelling of 20520170 in words is "twenty million, five hundred twenty thousand, one hundred seventy".