20423355109 has 2 divisors, whose sum is σ = 20423355110. Its totient is φ = 20423355108.

The previous prime is 20423355097. The next prime is 20423355167. The reversal of 20423355109 is 90155332402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20419552609 + 3802500 = 142897^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423355109 - 2¹³ = 20423346917 is a prime.

It is a super-2 number, since 2×20423355109² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20423353109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211677554 + 10211677555.

It is an arithmetic number, because the mean of its divisors is an integer number (10211677555).

Almost surely, 2^20423355109 is an apocalyptic number.

It is an amenable number.

20423355109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423355109 is an equidigital number, since it uses as much as digits as its factorization.

20423355109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 20423355109 in words is "twenty billion, four hundred twenty-three million, three hundred fifty-five thousand, one hundred nine".