20355340403 has 8 divisors (see below), whose sum is σ = 20818902528. Its totient is φ = 19893047944.

The previous prime is 20355340351. The next prime is 20355340463. The reversal of 20355340403 is 30404355302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20355340403 - 2⁶ = 20355340339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20355340463) 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 in 7 ways as a sum of consecutive naturals, for example, 284951 + ... + 349152.

It is an arithmetic number, because the mean of its divisors is an integer number (2602362816).

Almost surely, 2^20355340403 is an apocalyptic number.

20355340403 is a deficient number, since it is larger than the sum of its proper divisors (463562125).

20355340403 is an equidigital number, since it uses as much as digits as its factorization.

20355340403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634833.

The product of its (nonzero) digits is 21600, while the sum is 29.

Adding to 20355340403 its reverse (30404355302), we get a palindrome (50759695705).

The spelling of 20355340403 in words is "twenty billion, three hundred fifty-five million, three hundred forty thousand, four hundred three".