20570605 has 20 divisors (see below), whose sum is σ = 27249660. Its totient is φ = 14907200.

The previous prime is 20570593. The next prime is 20570609. The reversal of 20570605 is 50607502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10673289 + 9897316 = 3267^2 + 3146^2 .

It is not a de Polignac number, because 20570605 - 2⁷ = 20570477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20570605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20570609) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 73065 + ... + 73345.

It is an arithmetic number, because the mean of its divisors is an integer number (1362483).

Almost surely, 2^20570605 is an apocalyptic number.

It is an amenable number.

20570605 is a deficient number, since it is larger than the sum of its proper divisors (6679055).

20570605 is an frugal number, since it uses more digits than its factorization.

20570605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 20570605 is about 4535.4828849859. The cubic root of 20570605 is about 273.9990276485. Note that the first 3 decimals are identical.

The spelling of 20570605 in words is "twenty million, five hundred seventy thousand, six hundred five".