20001355403 has 8 divisors (see below), whose sum is σ = 20725072896. Its totient is φ = 19282545000.

The previous prime is 20001355397. The next prime is 20001355447. The reversal of 20001355403 is 30455310002.

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 20001355403 - 2¹⁴ = 20001339019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001375403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1218473 + ... + 1234778.

It is an arithmetic number, because the mean of its divisors is an integer number (2590634112).

Almost surely, 2^20001355403 is an apocalyptic number.

20001355403 is a deficient number, since it is larger than the sum of its proper divisors (723717493).

20001355403 is a wasteful number, since it uses less digits than its factorization.

20001355403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453545.

The product of its (nonzero) digits is 1800, while the sum is 23.

Adding to 20001355403 its reverse (30455310002), we get a palindrome (50456665405).

The spelling of 20001355403 in words is "twenty billion, one million, three hundred fifty-five thousand, four hundred three".