20703121 has 2 divisors, whose sum is σ = 20703122. Its totient is φ = 20703120.

The previous prime is 20703113. The next prime is 20703131. The reversal of 20703121 is 12130702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 4260096 = 4055^2 + 2064^2 .

It is a cyclic number.

It is not a de Polignac number, because 20703121 - 2³ = 20703113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20703095 and 20703104.

It is not a weakly prime, because it can be changed into another prime (20703101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10351560 + 10351561.

It is an arithmetic number, because the mean of its divisors is an integer number (10351561).

Almost surely, 2^20703121 is an apocalyptic number.

It is an amenable number.

20703121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20703121 is an equidigital number, since it uses as much as digits as its factorization.

20703121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20703121 is about 4550.0682412465. The cubic root of 20703121 is about 274.5861366944.

Adding to 20703121 its reverse (12130702), we get a palindrome (32833823).

The spelling of 20703121 in words is "twenty million, seven hundred three thousand, one hundred twenty-one".