20010123231 has 16 divisors (see below), whose sum is σ = 30502270464. Its totient is φ = 11430360864.

The previous prime is 20010123187. The next prime is 20010123233. The reversal of 20010123231 is 13232101002.

It is a de Polignac number, because none of the positive numbers 2^k-20010123231 is a prime.

It is a super-2 number, since 2×20010123231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20010123231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010123233) 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, 104400 + ... + 225653.

It is an arithmetic number, because the mean of its divisors is an integer number (1906391904).

Almost surely, 2^20010123231 is an apocalyptic number.

20010123231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20010123231 is a deficient number, since it is larger than the sum of its proper divisors (10492147233).

20010123231 is a wasteful number, since it uses less digits than its factorization.

20010123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332950.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20010123231 its reverse (13232101002), we get a palindrome (33242224233).

The spelling of 20010123231 in words is "twenty billion, ten million, one hundred twenty-three thousand, two hundred thirty-one".