20001001131 has 24 divisors (see below), whose sum is σ = 29184785760. Its totient is φ = 13198225536.

The previous prime is 20001001081. The next prime is 20001001157. The reversal of 20001001131 is 13110010002.

It is not a de Polignac number, because 20001001131 - 2²⁶ = 19933892267 is a prime.

It is a super-2 number, since 2×20001001131² (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 not an unprimeable number, because it can be changed into a prime (20001001171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2692935 + ... + 2700351.

It is an arithmetic number, because the mean of its divisors is an integer number (1216032740).

Almost surely, 2^20001001131 is an apocalyptic number.

20001001131 is a deficient number, since it is larger than the sum of its proper divisors (9183784629).

20001001131 is a wasteful number, since it uses less digits than its factorization.

20001001131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10435 (or 10432 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 20001001131 its reverse (13110010002), we get a palindrome (33111011133).

The spelling of 20001001131 in words is "twenty billion, one million, one thousand, one hundred thirty-one".