20109413 has 2 divisors, whose sum is σ = 20109414. Its totient is φ = 20109412.

The previous prime is 20109379. The next prime is 20109431. The reversal of 20109413 is 31490102.

Together with next prime (20109431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18992164 + 1117249 = 4358^2 + 1057^2 .

It is a cyclic number.

It is not a de Polignac number, because 20109413 - 2¹² = 20105317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20109493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054706 + 10054707.

It is an arithmetic number, because the mean of its divisors is an integer number (10054707).

Almost surely, 2^20109413 is an apocalyptic number.

It is an amenable number.

20109413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109413 is an equidigital number, since it uses as much as digits as its factorization.

20109413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20109413 is about 4484.3520156205. The cubic root of 20109413 is about 271.9358493826.

Adding to 20109413 its reverse (31490102), we get a palindrome (51599515).

The spelling of 20109413 in words is "twenty million, one hundred nine thousand, four hundred thirteen".