20800012 has 12 divisors (see below), whose sum is σ = 36809640. Its totient is φ = 10282976.

The previous prime is 20800007. The next prime is 20800019. The reversal of 20800012 is 21000802.

It is a junction number, because it is equal to n+sod(n) for n = 20799965 and 20800001.

It is not an unprimeable number, because it can be changed into a prime (20800019) 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 in 3 ways as a sum of consecutive naturals, for example, 28858 + ... + 29569.

It is an arithmetic number, because the mean of its divisors is an integer number (3067470).

Almost surely, 2^20800012 is an apocalyptic number.

It is an amenable number.

20800012 is a deficient number, since it is larger than the sum of its proper divisors (16009628).

20800012 is a wasteful number, since it uses less digits than its factorization.

20800012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58520 (or 58518 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 20800012 is about 4560.7030159834. The cubic root of 20800012 is about 275.0138263021.

Adding to 20800012 its reverse (21000802), we get a palindrome (41800814).

The spelling of 20800012 in words is "twenty million, eight hundred thousand, twelve".