20420421367 has 2 divisors, whose sum is σ = 20420421368. Its totient is φ = 20420421366.

The previous prime is 20420421347. The next prime is 20420421433. The reversal of 20420421367 is 76312402402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20420421367 - 2⁷ = 20420421239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420421347) 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, 10210210683 + 10210210684.

It is an arithmetic number, because the mean of its divisors is an integer number (10210210684).

Almost surely, 2^20420421367 is an apocalyptic number.

20420421367 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420421367 is an equidigital number, since it uses as much as digits as its factorization.

20420421367 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 31.

Adding to 20420421367 its reverse (76312402402), we get a palindrome (96732823769).

The spelling of 20420421367 in words is "twenty billion, four hundred twenty million, four hundred twenty-one thousand, three hundred sixty-seven".