20742812 has 6 divisors (see below), whose sum is σ = 36299928. Its totient is φ = 10371404.

The previous prime is 20742811. The next prime is 20742817. The reversal of 20742812 is 21824702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742811) 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 as a sum of consecutive naturals, namely, 2592848 + ... + 2592855.

It is an arithmetic number, because the mean of its divisors is an integer number (6049988).

Almost surely, 2^20742812 is an apocalyptic number.

It is an amenable number.

20742812 is a deficient number, since it is larger than the sum of its proper divisors (15557116).

20742812 is a wasteful number, since it uses less digits than its factorization.

20742812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5185707 (or 5185705 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20742812 is about 4554.4277357315. The cubic root of 20742812 is about 274.7614989986.

The spelling of 20742812 in words is "twenty million, seven hundred forty-two thousand, eight hundred twelve".