20036281009 has 2 divisors, whose sum is σ = 20036281010. Its totient is φ = 20036281008.

The previous prime is 20036280977. The next prime is 20036281037. The reversal of 20036281009 is 90018263002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19830272400 + 206008609 = 140820^2 + 14353^2 .

It is a cyclic number.

It is not a de Polignac number, because 20036281009 - 2⁵ = 20036280977 is a prime.

It is a super-2 number, since 2×20036281009² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20036281079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10018140504 + 10018140505.

It is an arithmetic number, because the mean of its divisors is an integer number (10018140505).

Almost surely, 2^20036281009 is an apocalyptic number.

It is an amenable number.

20036281009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20036281009 is an equidigital number, since it uses as much as digits as its factorization.

20036281009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 20036281009 in words is "twenty billion, thirty-six million, two hundred eighty-one thousand, nine".