20001001231 has 8 divisors (see below), whose sum is σ = 20144811024. Its totient is φ = 19857687360.

The previous prime is 20001001201. The next prime is 20001001291. The reversal of 20001001231 is 13210010002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001001231 is a prime.

It is a super-2 number, since 2×20001001231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001001201) 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, 42840 + ... + 204541.

It is an arithmetic number, because the mean of its divisors is an integer number (2518101378).

Almost surely, 2^20001001231 is an apocalyptic number.

20001001231 is a deficient number, since it is larger than the sum of its proper divisors (143809793).

20001001231 is a wasteful number, since it uses less digits than its factorization.

20001001231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247961.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 20001001231 its reverse (13210010002), we get a palindrome (33211011233).

The spelling of 20001001231 in words is "twenty billion, one million, one thousand, two hundred thirty-one".