20019201523 has 2 divisors, whose sum is σ = 20019201524. Its totient is φ = 20019201522.

The previous prime is 20019201473. The next prime is 20019201563. The reversal of 20019201523 is 32510291002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20019201523 - 2³³ = 11429266931 is a prime.

It is not a weakly prime, because it can be changed into another prime (20019201563) 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, 10009600761 + 10009600762.

It is an arithmetic number, because the mean of its divisors is an integer number (10009600762).

Almost surely, 2^20019201523 is an apocalyptic number.

20019201523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20019201523 is an equidigital number, since it uses as much as digits as its factorization.

20019201523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 20019201523 its reverse (32510291002), we get a palindrome (52529492525).

The spelling of 20019201523 in words is "twenty billion, nineteen million, two hundred one thousand, five hundred twenty-three".