20395904 has 32 divisors (see below), whose sum is σ = 41167200. Its totient is φ = 10063872.

The previous prime is 20395897. The next prime is 20395919. The reversal of 20395904 is 40959302.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9104 + ... + 11120.

It is an arithmetic number, because the mean of its divisors is an integer number (1286475).

Almost surely, 2^20395904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20395904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20583600).

20395904 is an abundant number, since it is smaller than the sum of its proper divisors (20771296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20395904 is an equidigital number, since it uses as much as digits as its factorization.

20395904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110 (or 2098 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 20395904 is about 4516.1824586702. The cubic root of 20395904 is about 273.2211529874.

The spelling of 20395904 in words is "twenty million, three hundred ninety-five thousand, nine hundred four".