20651812 has 24 divisors (see below), whose sum is σ = 36945216. Its totient is φ = 10098528.

The previous prime is 20651801. The next prime is 20651819. The reversal of 20651812 is 21815602.

It is not an unprimeable number, because it can be changed into a prime (20651819) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 70338 + ... + 70630.

It is an arithmetic number, because the mean of its divisors is an integer number (1539384).

Almost surely, 2^20651812 is an apocalyptic number.

It is an amenable number.

20651812 is a deficient number, since it is larger than the sum of its proper divisors (16293404).

20651812 is a wasteful number, since it uses less digits than its factorization.

20651812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 20651812 is about 4544.4264764654. The cubic root of 20651812 is about 274.3591114237.

The spelling of 20651812 in words is "twenty million, six hundred fifty-one thousand, eight hundred twelve".