20347121 has 2 divisors, whose sum is σ = 20347122. Its totient is φ = 20347120.

The previous prime is 20347073. The next prime is 20347169. The reversal of 20347121 is 12174302.

It is a balanced prime because it is at equal distance from previous prime (20347073) and next prime (20347169).

It can be written as a sum of positive squares in only one way, i.e., 10336225 + 10010896 = 3215^2 + 3164^2 .

It is a cyclic number.

It is not a de Polignac number, because 20347121 - 2²² = 16152817 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20347093 and 20347102.

It is not a weakly prime, because it can be changed into another prime (20347021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173560 + 10173561.

It is an arithmetic number, because the mean of its divisors is an integer number (10173561).

Almost surely, 2^20347121 is an apocalyptic number.

It is an amenable number.

20347121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20347121 is an equidigital number, since it uses as much as digits as its factorization.

20347121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20347121 is about 4510.7783142159. The cubic root of 20347121 is about 273.0031486262.

The spelling of 20347121 in words is "twenty million, three hundred forty-seven thousand, one hundred twenty-one".