20751212 has 6 divisors (see below), whose sum is σ = 36314628. Its totient is φ = 10375604.

The previous prime is 20751193. The next prime is 20751229. The reversal of 20751212 is 21215702.

It is a super-2 number, since 2×20751212² = 861225598937888, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2593898 + ... + 2593905.

It is an arithmetic number, because the mean of its divisors is an integer number (6052438).

Almost surely, 2^20751212 is an apocalyptic number.

It is an amenable number.

20751212 is a deficient number, since it is larger than the sum of its proper divisors (15563416).

20751212 is a wasteful number, since it uses less digits than its factorization.

20751212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5187807 (or 5187805 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 20751212 is about 4555.3498219127. The cubic root of 20751212 is about 274.7985830917.

Adding to 20751212 its reverse (21215702), we get a palindrome (41966914).

The spelling of 20751212 in words is "twenty million, seven hundred fifty-one thousand, two hundred twelve".