20613377 has 2 divisors, whose sum is σ = 20613378. Its totient is φ = 20613376.

The previous prime is 20613371. The next prime is 20613407. The reversal of 20613377 is 77331602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11182336 + 9431041 = 3344^2 + 3071^2 .

It is a cyclic number.

It is not a de Polignac number, because 20613377 - 2²⁰ = 19564801 is a prime.

It is a super-2 number, since 2×20613377² = 849822622688258, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20613371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306688 + 10306689.

It is an arithmetic number, because the mean of its divisors is an integer number (10306689).

Almost surely, 2^20613377 is an apocalyptic number.

It is an amenable number.

20613377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20613377 is an equidigital number, since it uses as much as digits as its factorization.

20613377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 20613377 is about 4540.1957006279. The cubic root of 20613377 is about 274.1888028657.

Adding to 20613377 its reverse (77331602), we get a palindrome (97944979).

The spelling of 20613377 in words is "twenty million, six hundred thirteen thousand, three hundred seventy-seven".