20420461093 has 2 divisors, whose sum is σ = 20420461094. Its totient is φ = 20420461092.

The previous prime is 20420461091. The next prime is 20420461129. The reversal of 20420461093 is 39016402402.

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., 13784403649 + 6636057444 = 117407^2 + 81462^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420461093 - 2¹ = 20420461091 is a prime.

Together with 20420461091, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420461091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210230546 + 10210230547.

It is an arithmetic number, because the mean of its divisors is an integer number (10210230547).

Almost surely, 2^20420461093 is an apocalyptic number.

It is an amenable number.

20420461093 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420461093 is an equidigital number, since it uses as much as digits as its factorization.

20420461093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 20420461093 its reverse (39016402402), we get a palindrome (59436863495).

The spelling of 20420461093 in words is "twenty billion, four hundred twenty million, four hundred sixty-one thousand, ninety-three".