20648413 has 2 divisors, whose sum is σ = 20648414. Its totient is φ = 20648412.

The previous prime is 20648401. The next prime is 20648417. The reversal of 20648413 is 31484602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18344089 + 2304324 = 4283^2 + 1518^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648413 - 2²¹ = 18551261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20648417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324206 + 10324207.

It is an arithmetic number, because the mean of its divisors is an integer number (10324207).

Almost surely, 2^20648413 is an apocalyptic number.

It is an amenable number.

20648413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648413 is an equidigital number, since it uses as much as digits as its factorization.

20648413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20648413 is about 4544.0524864926. The cubic root of 20648413 is about 274.3440587044.

The spelling of 20648413 in words is "twenty million, six hundred forty-eight thousand, four hundred thirteen".