20109377 has 2 divisors, whose sum is σ = 20109378. Its totient is φ = 20109376.

The previous prime is 20109343. The next prime is 20109379. The reversal of 20109377 is 77390102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18284176 + 1825201 = 4276^2 + 1351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20109377 is a prime.

Together with 20109379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20109379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054688 + 10054689.

It is an arithmetic number, because the mean of its divisors is an integer number (10054689).

Almost surely, 2^20109377 is an apocalyptic number.

It is an amenable number.

20109377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109377 is an equidigital number, since it uses as much as digits as its factorization.

20109377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 20109377 is about 4484.3480016609. The cubic root of 20109377 is about 271.9356871088.

Adding to 20109377 its reverse (77390102), we get a palindrome (97499479).

The spelling of 20109377 in words is "twenty million, one hundred nine thousand, three hundred seventy-seven".