164020505 has 32 divisors (see below), whose sum is σ = 228510720. Its totient is φ = 112085760.

The previous prime is 164020481. The next prime is 164020513. The reversal of 164020505 is 505020461.

It is not a de Polignac number, because 164020505 - 2⁸ = 164020249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269912 + ... + 270518.

It is an arithmetic number, because the mean of its divisors is an integer number (7140960).

Almost surely, 2^164020505 is an apocalyptic number.

It is an amenable number.

164020505 is a deficient number, since it is larger than the sum of its proper divisors (64490215).

164020505 is an equidigital number, since it uses as much as digits as its factorization.

164020505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 164020505 is about 12807.0490355897. The cubic root of 164020505 is about 547.3931791905.

Adding to 164020505 its reverse (505020461), we get a palindrome (669040966).

The spelling of 164020505 in words is "one hundred sixty-four million, twenty thousand, five hundred five".