20011455503 has 16 divisors (see below), whose sum is σ = 22062136320. Its totient is φ = 18035710176.

The previous prime is 20011455493. The next prime is 20011455511. The reversal of 20011455503 is 30555411002.

It is a cyclic number.

It is not a de Polignac number, because 20011455503 - 2⁴ = 20011455487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011455103) 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, 216926 + ... + 295092.

It is an arithmetic number, because the mean of its divisors is an integer number (1378883520).

Almost surely, 2^20011455503 is an apocalyptic number.

20011455503 is a deficient number, since it is larger than the sum of its proper divisors (2050680817).

20011455503 is a wasteful number, since it uses less digits than its factorization.

20011455503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78646.

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 20011455503 its reverse (30555411002), we get a palindrome (50566866505).

The spelling of 20011455503 in words is "twenty billion, eleven million, four hundred fifty-five thousand, five hundred three".