20101000203 has 16 divisors (see below), whose sum is σ = 30471802240. Its totient is φ = 13089022632.

The previous prime is 20101000189. The next prime is 20101000207. The reversal of 20101000203 is 30200010102.

It is a happy number.

It is not a de Polignac number, because 20101000203 - 2¹³ = 20100992011 is a prime.

It is a super-2 number, since 2×20101000203² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101000207) 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 15 ways as a sum of consecutive naturals, for example, 8655601 + ... + 8657922.

It is an arithmetic number, because the mean of its divisors is an integer number (1904487640).

Almost surely, 2^20101000203 is an apocalyptic number.

20101000203 is a deficient number, since it is larger than the sum of its proper divisors (10370802037).

20101000203 is a wasteful number, since it uses less digits than its factorization.

20101000203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17313575 (or 17313569 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 20101000203 its reverse (30200010102), we get a palindrome (50301010305).

The spelling of 20101000203 in words is "twenty billion, one hundred one million, two hundred three", and thus it is an aban number.