20123212 has 12 divisors (see below), whose sum is σ = 35257320.
Its totient is φ = 10049696.
The previous prime is 20123179. The next prime is 20123231. The reversal of 20123212 is 21232102.
It is a super-2 number, since 2×201232122 = 809887322393888, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 20123192 and 20123201.
It is an unprimeable number.
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, 1608 + ... + 6544.
It is an arithmetic number, because the mean of its divisors is an integer number (2938110).
Almost surely, 220123212 is an apocalyptic number.
It is an amenable number.
20123212 is a deficient number, since it is larger than the sum of its proper divisors (15134108).
20123212 is a wasteful number, since it uses less digits than its factorization.
20123212 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5960 (or 5958 counting only the distinct ones).
The product of its (nonzero) digits is 48, while the sum is 13.
The square root of 20123212 is about 4485.8903241163.
The cubic root of 20123212 is about 271.9980355971.
Adding to 20123212 its reverse (21232102), we get a palindrome (41355314).
The spelling of 20123212 in words is "twenty million, one hundred twenty-three thousand, two hundred twelve".