20580155 has 8 divisors (see below), whose sum is σ = 25298784. Its totient is φ = 16062400.

The previous prime is 20580127. The next prime is 20580163. The reversal of 20580155 is 55108502.

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

It is not a de Polignac number, because 20580155 - 2¹⁶ = 20514619 is a prime.

It is a Duffinian number.

It is a zygodrome in base 7.

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, 49991 + ... + 50400.

It is an arithmetic number, because the mean of its divisors is an integer number (3162348).

Almost surely, 2^20580155 is an apocalyptic number.

20580155 is a deficient number, since it is larger than the sum of its proper divisors (4718629).

20580155 is a wasteful number, since it uses less digits than its factorization.

20580155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100437.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 20580155 is about 4536.5355724385. The cubic root of 20580155 is about 274.0414228670.

Adding to 20580155 its reverse (55108502), we get a palindrome (75688657).

The spelling of 20580155 in words is "twenty million, five hundred eighty thousand, one hundred fifty-five".