20820004 has 6 divisors (see below), whose sum is σ = 36435014. Its totient is φ = 10410000.

The previous prime is 20820001. The next prime is 20820017. The reversal of 20820004 is 40002802.

It can be written as a sum of positive squares in only one way, i.e., 15288100 + 5531904 = 3910^2 + 2352^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20820004.

It is not an unprimeable number, because it can be changed into a prime (20820001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2602497 + ... + 2602504.

Almost surely, 2^20820004 is an apocalyptic number.

It is an amenable number.

20820004 is a deficient number, since it is larger than the sum of its proper divisors (15615010).

20820004 is a wasteful number, since it uses less digits than its factorization.

20820004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5205005 (or 5205003 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 20820004 is about 4562.8942569382. The cubic root of 20820004 is about 275.1019082362.

Adding to 20820004 its reverse (40002802), we get a palindrome (60822806).

The spelling of 20820004 in words is "twenty million, eight hundred twenty thousand, four".