20390946 has 8 divisors (see below), whose sum is σ = 40781904. Its totient is φ = 6796980.

The previous prime is 20390941. The next prime is 20390947. The reversal of 20390946 is 64909302.

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

20390946 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20390941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1699240 + ... + 1699251.

It is an arithmetic number, because the mean of its divisors is an integer number (5097738).

Almost surely, 2^20390946 is an apocalyptic number.

20390946 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20390946 is a wasteful number, since it uses less digits than its factorization.

20390946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398496.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20390946 is about 4515.6335103726. The cubic root of 20390946 is about 273.1990122632.

The spelling of 20390946 in words is "twenty million, three hundred ninety thousand, nine hundred forty-six".