20894165 has 8 divisors (see below), whose sum is σ = 25111608. Its totient is φ = 16689600.

The previous prime is 20894161. The next prime is 20894183. The reversal of 20894165 is 56149802.

It can be written as a sum of positive squares in 4 ways, for example, as 11444689 + 9449476 = 3383^2 + 3074^2 .

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

It is not a de Polignac number, because 20894165 - 2² = 20894161 is a prime.

It is a super-2 number, since 2×20894165² = 873132262094450, 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 (20894161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 815 + ... + 6515.

It is an arithmetic number, because the mean of its divisors is an integer number (3138951).

Almost surely, 2^20894165 is an apocalyptic number.

It is an amenable number.

20894165 is a deficient number, since it is larger than the sum of its proper divisors (4217443).

20894165 is an equidigital number, since it uses as much as digits as its factorization.

20894165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6439.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20894165 is about 4571.0135637515. The cubic root of 20894165 is about 275.4281594802.

The spelling of 20894165 in words is "twenty million, eight hundred ninety-four thousand, one hundred sixty-five".