20009992361 has 2 divisors, whose sum is σ = 20009992362. Its totient is φ = 20009992360.

The previous prime is 20009992339. The next prime is 20009992363. The reversal of 20009992361 is 16329990002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19978126336 + 31866025 = 141344^2 + 5645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20009992361 is a prime.

Together with 20009992363, 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 (20009992363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004996180 + 10004996181.

It is an arithmetic number, because the mean of its divisors is an integer number (10004996181).

Almost surely, 2^20009992361 is an apocalyptic number.

It is an amenable number.

20009992361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20009992361 is an equidigital number, since it uses as much as digits as its factorization.

20009992361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The spelling of 20009992361 in words is "twenty billion, nine million, nine hundred ninety-two thousand, three hundred sixty-one".