20390968 has 32 divisors (see below), whose sum is σ = 41655600. Its totient is φ = 9301248.

The previous prime is 20390947. The next prime is 20391037. The reversal of 20390968 is 86909302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8155 + ... + 10357.

Almost surely, 2^20390968 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 20390968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20827800).

20390968 is an abundant number, since it is smaller than the sum of its proper divisors (21264632).

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

20390968 is a wasteful number, since it uses less digits than its factorization.

20390968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311 (or 2307 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20390968 is about 4515.6359463535. The cubic root of 20390968 is about 273.1991105156.

The spelling of 20390968 in words is "twenty million, three hundred ninety thousand, nine hundred sixty-eight".