20277739609 has 2 divisors, whose sum is σ = 20277739610. Its totient is φ = 20277739608.

The previous prime is 20277739591. The next prime is 20277739613. The reversal of 20277739609 is 90693777202.

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., 20232217600 + 45522009 = 142240^2 + 6747^2 .

It is a cyclic number.

It is not a de Polignac number, because 20277739609 - 2¹¹ = 20277737561 is a prime.

It is a super-2 number, since 2×20277739609² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20277739679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10138869804 + 10138869805.

It is an arithmetic number, because the mean of its divisors is an integer number (10138869805).

Almost surely, 2^20277739609 is an apocalyptic number.

It is an amenable number.

20277739609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20277739609 is an equidigital number, since it uses as much as digits as its factorization.

20277739609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000376, while the sum is 52.

The spelling of 20277739609 in words is "twenty billion, two hundred seventy-seven million, seven hundred thirty-nine thousand, six hundred nine".