20182865 has 8 divisors (see below), whose sum is σ = 24810408. Its totient is φ = 15752320.

The previous prime is 20182853. The next prime is 20182889. The reversal of 20182865 is 56828102.

It can be written as a sum of positive squares in 4 ways, for example, as 2534464 + 17648401 = 1592^2 + 4201^2 .

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

It is not a de Polignac number, because 20182865 - 2⁴ = 20182849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49022 + ... + 49431.

It is an arithmetic number, because the mean of its divisors is an integer number (3101301).

Almost surely, 2^20182865 is an apocalyptic number.

It is an amenable number.

20182865 is a deficient number, since it is larger than the sum of its proper divisors (4627543).

20182865 is an equidigital number, since it uses as much as digits as its factorization.

20182865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98499.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 20182865 is about 4492.5343626955. The cubic root of 20182865 is about 272.2665396557.

The spelling of 20182865 in words is "twenty million, one hundred eighty-two thousand, eight hundred sixty-five".