20123002131 has 16 divisors (see below), whose sum is σ = 27738160128. Its totient is φ = 12962901600.

The previous prime is 20123002103. The next prime is 20123002169. The reversal of 20123002131 is 13120032102.

It is not a de Polignac number, because 20123002131 - 2¹¹ = 20123000083 is a prime.

It is a super-2 number, since 2×20123002131² (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 20123002131.

It is not an unprimeable number, because it can be changed into a prime (20123002831) 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, 102201 + ... + 225146.

It is an arithmetic number, because the mean of its divisors is an integer number (1733635008).

Almost surely, 2^20123002131 is an apocalyptic number.

20123002131 is a deficient number, since it is larger than the sum of its proper divisors (7615157997).

20123002131 is a wasteful number, since it uses less digits than its factorization.

20123002131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328042.

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

Adding to 20123002131 its reverse (13120032102), we get a palindrome (33243034233).

The spelling of 20123002131 in words is "twenty billion, one hundred twenty-three million, two thousand, one hundred thirty-one".