20580605 has 8 divisors (see below), whose sum is σ = 24834264. Its totient is φ = 16372800.

The previous prime is 20580569. The next prime is 20580619. The reversal of 20580605 is 50608502.

It can be written as a sum of positive squares in 4 ways, for example, as 1413721 + 19166884 = 1189^2 + 4378^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20580605 - 2⁸ = 20580349 is a prime.

It is a super-2 number, since 2×20580605² = 847122604332050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10466 + ... + 12275.

It is an arithmetic number, because the mean of its divisors is an integer number (3104283).

Almost surely, 2^20580605 is an apocalyptic number.

It is an amenable number.

20580605 is a deficient number, since it is larger than the sum of its proper divisors (4253659).

20580605 is a wasteful number, since it uses less digits than its factorization.

20580605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22927.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 20580605 is about 4536.5851694860. The cubic root of 20580605 is about 274.0434202239.

The spelling of 20580605 in words is "twenty million, five hundred eighty thousand, six hundred five".