20396505 has 16 divisors (see below), whose sum is σ = 32803200. Its totient is φ = 10821888.

The previous prime is 20396479. The next prime is 20396507. The reversal of 20396505 is 50569302.

20396505 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 20396505 - 2⁹ = 20395993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20396507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432 + ... + 6401.

It is an arithmetic number, because the mean of its divisors is an integer number (2050200).

Almost surely, 2^20396505 is an apocalyptic number.

It is an amenable number.

20396505 is a deficient number, since it is larger than the sum of its proper divisors (12406695).

20396505 is a wasteful number, since it uses less digits than its factorization.

20396505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 20396505 is about 4516.2489966785. The cubic root of 20396505 is about 273.2238366031.

The spelling of 20396505 in words is "twenty million, three hundred ninety-six thousand, five hundred five".