20747308 has 12 divisors (see below), whose sum is σ = 37479232. Its totient is φ = 10038960.

The previous prime is 20747303. The next prime is 20747317. The reversal of 20747308 is 80374702.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 20747308.

It is not an unprimeable number, because it can be changed into a prime (20747303) 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, 83535 + ... + 83782.

Almost surely, 2^20747308 is an apocalyptic number.

It is an amenable number.

20747308 is a deficient number, since it is larger than the sum of its proper divisors (16731924).

20747308 is a wasteful number, since it uses less digits than its factorization.

20747308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167352 (or 167350 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20747308 is about 4554.9212945999. The cubic root of 20747308 is about 274.7813490630.

The spelling of 20747308 in words is "twenty million, seven hundred forty-seven thousand, three hundred eight".