12820895 has 16 divisors (see below), whose sum is σ = 15914880. Its totient is φ = 9909504.

The previous prime is 12820891. The next prime is 12820909. The reversal of 12820895 is 59802821.

12820895 = T₃₅₄ + T₃₅₅ + ... + T₄₉₄.

It is a cyclic number.

It is not a de Polignac number, because 12820895 - 2² = 12820891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820891) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 20609 + ... + 21221.

It is an arithmetic number, because the mean of its divisors is an integer number (994680).

Almost surely, 2^12820895 is an apocalyptic number.

12820895 is a deficient number, since it is larger than the sum of its proper divisors (3093985).

12820895 is an equidigital number, since it uses as much as digits as its factorization.

12820895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 12820895 is about 3580.6277382604. The cubic root of 12820895 is about 234.0486360054.

The spelling of 12820895 in words is "twelve million, eight hundred twenty thousand, eight hundred ninety-five".