20355253401603 has 16 divisors (see below), whose sum is σ = 28464110712576. Its totient is φ = 12914272435680.

The previous prime is 20355253401547. The next prime is 20355253401617. The reversal of 20355253401603 is 30610435255302.

It is not a de Polignac number, because 20355253401603 - 2²⁰ = 20355252353027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20355253501603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 748726693 + ... + 748753878.

It is an arithmetic number, because the mean of its divisors is an integer number (1779006919536).

Almost surely, 2^{20355253401603} is an apocalyptic number.

20355253401603 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20355253401603 is a deficient number, since it is larger than the sum of its proper divisors (8108857310973).

20355253401603 is a wasteful number, since it uses less digits than its factorization.

20355253401603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497480794.

The product of its (nonzero) digits is 324000, while the sum is 39.

Adding to 20355253401603 its reverse (30610435255302), we get a palindrome (50965688656905).

The spelling of 20355253401603 in words is "twenty trillion, three hundred fifty-five billion, two hundred fifty-three million, four hundred one thousand, six hundred three".