20404346 has 8 divisors (see below), whose sum is σ = 30765684. Its totient is φ = 10149120.

The previous prime is 20404343. The next prime is 20404361. The reversal of 20404346 is 64340402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20349121 + 55225 = 4511^2 + 235^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20404343) 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, 26045 + ... + 26816.

Almost surely, 2^20404346 is an apocalyptic number.

20404346 is a deficient number, since it is larger than the sum of its proper divisors (10361338).

20404346 is a wasteful number, since it uses less digits than its factorization.

20404346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53056.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 20404346 is about 4517.1170009199. The cubic root of 20404346 is about 273.2588438038.

Adding to 20404346 its reverse (64340402), we get a palindrome (84744748).

The spelling of 20404346 in words is "twenty million, four hundred four thousand, three hundred forty-six".