20747986 has 8 divisors (see below), whose sum is σ = 35568000. Its totient is φ = 8891988.

The previous prime is 20747983. The next prime is 20748017. The reversal of 20747986 is 68974702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20747983) 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 3 ways as a sum of consecutive naturals, for example, 740986 + ... + 741013.

It is an arithmetic number, because the mean of its divisors is an integer number (4446000).

Almost surely, 2^20747986 is an apocalyptic number.

20747986 is a deficient number, since it is larger than the sum of its proper divisors (14820014).

20747986 is a wasteful number, since it uses less digits than its factorization.

20747986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482008.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 20747986 is about 4554.9957189881. The cubic root of 20747986 is about 274.7843422180.

The spelling of 20747986 in words is "twenty million, seven hundred forty-seven thousand, nine hundred eighty-six".