20394865 has 8 divisors (see below), whose sum is σ = 24513408. Its totient is φ = 16289520.

The previous prime is 20394863. The next prime is 20394937. The reversal of 20394865 is 56849302.

20394865 is nontrivially palindromic in base 4.

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

It is not a de Polignac number, because 20394865 - 2¹ = 20394863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20394863) 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, 504 + ... + 6406.

It is an arithmetic number, because the mean of its divisors is an integer number (3064176).

Almost surely, 2^20394865 is an apocalyptic number.

It is an amenable number.

20394865 is a deficient number, since it is larger than the sum of its proper divisors (4118543).

20394865 is an equidigital number, since it uses as much as digits as its factorization.

20394865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6599.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 20394865 is about 4516.0674264231. The cubic root of 20394865 is about 273.2165134677.

The spelling of 20394865 in words is "twenty million, three hundred ninety-four thousand, eight hundred sixty-five".