20340646 has 16 divisors (see below), whose sum is σ = 31004064. Its totient is φ = 10007424.

The previous prime is 20340643. The next prime is 20340679. The reversal of 20340646 is 64604302.

It is a self number, because there is not a number n which added to its sum of digits gives 20340646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60190 + ... + 60526.

It is an arithmetic number, because the mean of its divisors is an integer number (1937754).

Almost surely, 2^20340646 is an apocalyptic number.

20340646 is a deficient number, since it is larger than the sum of its proper divisors (10663418).

20340646 is a wasteful number, since it uses less digits than its factorization.

20340646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20340646 is about 4510.0605317446. The cubic root of 20340646 is about 272.9741865774.

Adding to 20340646 its reverse (64604302), we get a palindrome (84944948).

The spelling of 20340646 in words is "twenty million, three hundred forty thousand, six hundred forty-six".