20276915809 has 2 divisors, whose sum is σ = 20276915810. Its totient is φ = 20276915808.

The previous prime is 20276915777. The next prime is 20276915873. The reversal of 20276915809 is 90851967202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17206093584 + 3070822225 = 131172^2 + 55415^2 .

It is a cyclic number.

It is not a de Polignac number, because 20276915809 - 2⁵ = 20276915777 is a prime.

It is a super-2 number, since 2×20276915809² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20276945809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10138457904 + 10138457905.

It is an arithmetic number, because the mean of its divisors is an integer number (10138457905).

Almost surely, 2^20276915809 is an apocalyptic number.

It is an amenable number.

20276915809 is a deficient number, since it is larger than the sum of its proper divisors (1).

20276915809 is an equidigital number, since it uses as much as digits as its factorization.

20276915809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 20276915809 in words is "twenty billion, two hundred seventy-six million, nine hundred fifteen thousand, eight hundred nine".