20351646 has 24 divisors (see below), whose sum is σ = 50394864. Its totient is φ = 5814720.

The previous prime is 20351633. The next prime is 20351647. The reversal of 20351646 is 64615302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351647) 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 11 ways as a sum of consecutive naturals, for example, 80635 + ... + 80886.

It is an arithmetic number, because the mean of its divisors is an integer number (2099786).

Almost surely, 2^20351646 is an apocalyptic number.

20351646 is an abundant number, since it is smaller than the sum of its proper divisors (30043218).

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

20351646 is a wasteful number, since it uses less digits than its factorization.

20351646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161536 (or 161533 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20351646 is about 4511.2798627441. The cubic root of 20351646 is about 273.0233848664.

Adding to 20351646 its reverse (64615302), we get a palindrome (84966948).

The spelling of 20351646 in words is "twenty million, three hundred fifty-one thousand, six hundred forty-six".