20847639299 has 2 divisors, whose sum is σ = 20847639300. Its totient is φ = 20847639298.

The previous prime is 20847639269. The next prime is 20847639301. The reversal of 20847639299 is 99293674802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20847639299 - 2¹⁶ = 20847573763 is a prime.

It is a super-2 number, since 2×20847639299² (a number of 21 digits) contains 22 as substring.

Together with 20847639301, 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 (20847639229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10423819649 + 10423819650.

It is an arithmetic number, because the mean of its divisors is an integer number (10423819650).

Almost surely, 2^20847639299 is an apocalyptic number.

20847639299 is a deficient number, since it is larger than the sum of its proper divisors (1).

20847639299 is an equidigital number, since it uses as much as digits as its factorization.

20847639299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11757312, while the sum is 59.

The spelling of 20847639299 in words is "twenty billion, eight hundred forty-seven million, six hundred thirty-nine thousand, two hundred ninety-nine".