20678895 has 20 divisors (see below), whose sum is σ = 37069560. Its totient is φ = 11028528.

The previous prime is 20678873. The next prime is 20678899. The reversal of 20678895 is 59887602.

It is not a de Polignac number, because 20678895 - 2⁶ = 20678831 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20678895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678899) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25125 + ... + 25934.

It is an arithmetic number, because the mean of its divisors is an integer number (1853478).

Almost surely, 2^20678895 is an apocalyptic number.

20678895 is a deficient number, since it is larger than the sum of its proper divisors (16390665).

20678895 is an equidigital number, since it uses as much as digits as its factorization.

20678895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51076 (or 51067 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 20678895 is about 4547.4053041267. The cubic root of 20678895 is about 274.4789914944.

The spelling of 20678895 in words is "twenty million, six hundred seventy-eight thousand, eight hundred ninety-five".