20394646 has 8 divisors (see below), whose sum is σ = 30611880. Its totient is φ = 10190688.

The previous prime is 20394643. The next prime is 20394691. The reversal of 20394646 is 64649302.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20394641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2725 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (3826485).

Almost surely, 2^20394646 is an apocalyptic number.

20394646 is a deficient number, since it is larger than the sum of its proper divisors (10217234).

20394646 is a wasteful number, since it uses less digits than its factorization.

20394646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6638.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 20394646 is about 4516.0431795987. The cubic root of 20394646 is about 273.2155355315.

It can be divided in two parts, 203 and 94646, that added together give a palindrome (94849).

The spelling of 20394646 in words is "twenty million, three hundred ninety-four thousand, six hundred forty-six".