20847639353 has 2 divisors, whose sum is σ = 20847639354. Its totient is φ = 20847639352.

The previous prime is 20847639347. The next prime is 20847639413. The reversal of 20847639353 is 35393674802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16782684304 + 4064955049 = 129548^2 + 63757^2 .

It is a cyclic number.

It is not a de Polignac number, because 20847639353 - 2¹² = 20847635257 is a prime.

It is not a weakly prime, because it can be changed into another prime (20847639313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10423819676 + 10423819677.

It is an arithmetic number, because the mean of its divisors is an integer number (10423819677).

Almost surely, 2^20847639353 is an apocalyptic number.

It is an amenable number.

20847639353 is a deficient number, since it is larger than the sum of its proper divisors (1).

20847639353 is an equidigital number, since it uses as much as digits as its factorization.

20847639353 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 50.

The spelling of 20847639353 in words is "twenty billion, eight hundred forty-seven million, six hundred thirty-nine thousand, three hundred fifty-three".