20347697 has 2 divisors, whose sum is σ = 20347698. Its totient is φ = 20347696.

The previous prime is 20347681. The next prime is 20347711. The reversal of 20347697 is 79674302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15437041 + 4910656 = 3929^2 + 2216^2 .

It is a cyclic number.

It is not a de Polignac number, because 20347697 - 2⁴ = 20347681 is a prime.

It is a super-3 number, since 3×20347697³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20347697.

It is not a weakly prime, because it can be changed into another prime (20347627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173848 + 10173849.

It is an arithmetic number, because the mean of its divisors is an integer number (10173849).

Almost surely, 2^20347697 is an apocalyptic number.

It is an amenable number.

20347697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20347697 is an equidigital number, since it uses as much as digits as its factorization.

20347697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 20347697 is about 4510.8421608387. The cubic root of 20347697 is about 273.0057247208.

The spelling of 20347697 in words is "twenty million, three hundred forty-seven thousand, six hundred ninety-seven".