20704747 has 8 divisors (see below), whose sum is σ = 23907296. Its totient is φ = 17563392.

The previous prime is 20704729. The next prime is 20704763. The reversal of 20704747 is 74740702.

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

It is a de Polignac number, because none of the positive numbers 2^k-20704747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20704727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14568 + ... + 15925.

It is an arithmetic number, because the mean of its divisors is an integer number (2988412).

Almost surely, 2^20704747 is an apocalyptic number.

20704747 is a deficient number, since it is larger than the sum of its proper divisors (3202549).

20704747 is an equidigital number, since it uses as much as digits as its factorization.

20704747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30597.

The product of its (nonzero) digits is 10976, while the sum is 31.

The square root of 20704747 is about 4550.2469163772. The cubic root of 20704747 is about 274.5933250691.

The spelling of 20704747 in words is "twenty million, seven hundred four thousand, seven hundred forty-seven".