20678855 has 4 divisors (see below), whose sum is σ = 24814632. Its totient is φ = 16543080.

The previous prime is 20678843. The next prime is 20678857. The reversal of 20678855 is 55887602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20678855 - 2⁴ = 20678839 is a prime.

It is a super-2 number, since 2×20678855² = 855230088222050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678857) 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 3 ways as a sum of consecutive naturals, for example, 2067881 + ... + 2067890.

It is an arithmetic number, because the mean of its divisors is an integer number (6203658).

Almost surely, 2^20678855 is an apocalyptic number.

20678855 is a deficient number, since it is larger than the sum of its proper divisors (4135777).

20678855 is an equidigital number, since it uses as much as digits as its factorization.

20678855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135776.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 20678855 is about 4547.4009060121. The cubic root of 20678855 is about 274.4788145158.

The spelling of 20678855 in words is "twenty million, six hundred seventy-eight thousand, eight hundred fifty-five".