20355253401445 has 16 divisors (see below), whose sum is σ = 25269458200560. Its totient is φ = 15722138543104.

The previous prime is 20355253401433. The next prime is 20355253401479. The reversal of 20355253401445 is 54410435255302.

It can be written as a sum of positive squares in 8 ways, for example, as 1425784059844 + 18929469341601 = 1194062^2 + 4350801^2 .

It is a cyclic number.

It is not a de Polignac number, because 20355253401445 - 2⁷ = 20355253401317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1852239 + ... + 6643891.

It is an arithmetic number, because the mean of its divisors is an integer number (1579341137535).

Almost surely, 2^{20355253401445} is an apocalyptic number.

It is an amenable number.

20355253401445 is a deficient number, since it is larger than the sum of its proper divisors (4914204799115).

20355253401445 is a wasteful number, since it uses less digits than its factorization.

20355253401445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4820984.

The product of its (nonzero) digits is 1440000, while the sum is 43.

Adding to 20355253401445 its reverse (54410435255302), we get a palindrome (74765688656747).

The spelling of 20355253401445 in words is "twenty trillion, three hundred fifty-five billion, two hundred fifty-three million, four hundred one thousand, four hundred forty-five".