20716347 has 4 divisors (see below), whose sum is σ = 27621800. Its totient is φ = 13810896.

The previous prime is 20716343. The next prime is 20716349. The reversal of 20716347 is 74361702.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20716347 - 2² = 20716343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20716343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3452722 + ... + 3452727.

It is an arithmetic number, because the mean of its divisors is an integer number (6905450).

Almost surely, 2^20716347 is an apocalyptic number.

20716347 is a deficient number, since it is larger than the sum of its proper divisors (6905453).

20716347 is an equidigital number, since it uses as much as digits as its factorization.

20716347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6905452.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 20716347 is about 4551.5213939956. The cubic root of 20716347 is about 274.6445965302.

The spelling of 20716347 in words is "twenty million, seven hundred sixteen thousand, three hundred forty-seven".