20321146 has 16 divisors (see below), whose sum is σ = 32175360. Its totient is φ = 9599040.

The previous prime is 20321131. The next prime is 20321149. The reversal of 20321146 is 64112302.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (20321149) 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 7 ways as a sum of consecutive naturals, for example, 22626 + ... + 23506.

It is an arithmetic number, because the mean of its divisors is an integer number (2010960).

Almost surely, 2^20321146 is an apocalyptic number.

20321146 is a deficient number, since it is larger than the sum of its proper divisors (11854214).

20321146 is a wasteful number, since it uses less digits than its factorization.

20321146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20321146 is about 4507.8981798617. The cubic root of 20321146 is about 272.8869278190.

Adding to 20321146 its reverse (64112302), we get a palindrome (84433448).

The spelling of 20321146 in words is "twenty million, three hundred twenty-one thousand, one hundred forty-six".