20451212 has 6 divisors (see below), whose sum is σ = 35789628. Its totient is φ = 10225604.

The previous prime is 20451203. The next prime is 20451241. The reversal of 20451212 is 21215402.

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 as a sum of consecutive naturals, namely, 2556398 + ... + 2556405.

It is an arithmetic number, because the mean of its divisors is an integer number (5964938).

Almost surely, 2^20451212 is an apocalyptic number.

It is an amenable number.

20451212 is a deficient number, since it is larger than the sum of its proper divisors (15338416).

20451212 is a wasteful number, since it uses less digits than its factorization.

20451212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5112807 (or 5112805 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20451212 is about 4522.3016263845. The cubic root of 20451212 is about 273.4678965958.

Adding to 20451212 its reverse (21215402), we get a palindrome (41666614).

The spelling of 20451212 in words is "twenty million, four hundred fifty-one thousand, two hundred twelve".