20465505 has 24 divisors (see below), whose sum is σ = 35611368. Its totient is φ = 10872576.

The previous prime is 20465491. The next prime is 20465509. The reversal of 20465505 is 50556402.

20465505 is a `hidden beast` number, since 2 + 0 + 4 + 655 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1595169 + 18870336 = 1263^2 + 4344^2 .

It is not a de Polignac number, because 20465505 - 2¹³ = 20457313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20465509) 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 23 ways as a sum of consecutive naturals, for example, 13359 + ... + 14811.

It is an arithmetic number, because the mean of its divisors is an integer number (1483807).

Almost surely, 2^20465505 is an apocalyptic number.

It is an amenable number.

20465505 is a deficient number, since it is larger than the sum of its proper divisors (15145863).

20465505 is a wasteful number, since it uses less digits than its factorization.

20465505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777 (or 1774 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 20465505 is about 4523.8816297512. The cubic root of 20465505 is about 273.5315890953.

The spelling of 20465505 in words is "twenty million, four hundred sixty-five thousand, five hundred five".