20717812 has 12 divisors (see below), whose sum is σ = 36310176. Its totient is φ = 10343480.

The previous prime is 20717773. The next prime is 20717813. The reversal of 20717812 is 21871702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717813) 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 in 3 ways as a sum of consecutive naturals, for example, 514 + ... + 6457.

It is an arithmetic number, because the mean of its divisors is an integer number (3025848).

Almost surely, 2^20717812 is an apocalyptic number.

It is an amenable number.

20717812 is a deficient number, since it is larger than the sum of its proper divisors (15592364).

20717812 is a wasteful number, since it uses less digits than its factorization.

20717812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7718 (or 7716 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 20717812 is about 4551.6823263492. The cubic root of 20717812 is about 274.6510704009.

The spelling of 20717812 in words is "twenty million, seven hundred seventeen thousand, eight hundred twelve".