20123212031 has 4 divisors (see below), whose sum is σ = 21671151432. Its totient is φ = 18575272632.

The previous prime is 20123212019. The next prime is 20123212033. The reversal of 20123212031 is 13021232102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13021232102 = 2 ⋅6510616051.

It is a cyclic number.

It is not a de Polignac number, because 20123212031 - 2²⁶ = 20056103167 is a prime.

It is a super-2 number, since 2×20123212031² (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 (20123212033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773969681 + ... + 773969706.

It is an arithmetic number, because the mean of its divisors is an integer number (5417787858).

Almost surely, 2^20123212031 is an apocalyptic number.

20123212031 is a deficient number, since it is larger than the sum of its proper divisors (1547939401).

20123212031 is a wasteful number, since it uses less digits than its factorization.

20123212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547939400.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20123212031 its reverse (13021232102), we get a palindrome (33144444133).

The spelling of 20123212031 in words is "twenty billion, one hundred twenty-three million, two hundred twelve thousand, thirty-one".