20581196 has 12 divisors (see below), whose sum is σ = 36524880. Its totient is φ = 10145520.

The previous prime is 20581189. The next prime is 20581201. The reversal of 20581196 is 69118502.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 35951 + ... + 36518.

It is an arithmetic number, because the mean of its divisors is an integer number (3043740).

Almost surely, 2^20581196 is an apocalyptic number.

It is an amenable number.

20581196 is a deficient number, since it is larger than the sum of its proper divisors (15943684).

20581196 is a wasteful number, since it uses less digits than its factorization.

20581196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72544 (or 72542 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 20581196 is about 4536.6503061179. The cubic root of 20581196 is about 274.0460433750.

Adding to 20581196 its reverse (69118502), we get a palindrome (89699698).

The spelling of 20581196 in words is "twenty million, five hundred eighty-one thousand, one hundred ninety-six".