20503551201 has 32 divisors (see below), whose sum is σ = 31450848000. Its totient is φ = 11638681344.

The previous prime is 20503551197. The next prime is 20503551223. The reversal of 20503551201 is 10215530502.

It is a happy number.

It is not a de Polignac number, because 20503551201 - 2² = 20503551197 is a prime.

It is a super-2 number, since 2×20503551201² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20503551701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7457175 + ... + 7459923.

It is an arithmetic number, because the mean of its divisors is an integer number (982839000).

Almost surely, 2^20503551201 is an apocalyptic number.

20503551201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20503551201 is a deficient number, since it is larger than the sum of its proper divisors (10947296799).

20503551201 is a wasteful number, since it uses less digits than its factorization.

20503551201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4985.

The product of its (nonzero) digits is 1500, while the sum is 24.

The spelling of 20503551201 in words is "twenty billion, five hundred three million, five hundred fifty-one thousand, two hundred one".