20420023299989 has 2 divisors, whose sum is σ = 20420023299990. Its totient is φ = 20420023299988.

The previous prime is 20420023299959. The next prime is 20420023300049. The reversal of 20420023299989 is 98999232002402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14545299268900 + 5874724031089 = 3813830^2 + 2423783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20420023299989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420023299959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210011649994 + 10210011649995.

It is an arithmetic number, because the mean of its divisors is an integer number (10210011649995).

Almost surely, 2^{20420023299989} is an apocalyptic number.

It is an amenable number.

20420023299989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420023299989 is an equidigital number, since it uses as much as digits as its factorization.

20420023299989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10077696, while the sum is 59.

The spelling of 20420023299989 in words is "twenty trillion, four hundred twenty billion, twenty-three million, two hundred ninety-nine thousand, nine hundred eighty-nine".