20123243245 has 16 divisors (see below), whose sum is σ = 27635276160. Its totient is φ = 13779952704.

The previous prime is 20123243233. The next prime is 20123243263. The reversal of 20123243245 is 54234232102.

It is not a de Polignac number, because 20123243245 - 2³¹ = 17975759597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366535 + ... + 417844.

It is an arithmetic number, because the mean of its divisors is an integer number (1727204760).

Almost surely, 2^20123243245 is an apocalyptic number.

It is an amenable number.

20123243245 is a deficient number, since it is larger than the sum of its proper divisors (7512032915).

20123243245 is an equidigital number, since it uses as much as digits as its factorization.

20123243245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785124.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 20123243245 its reverse (54234232102), we get a palindrome (74357475347).

The spelling of 20123243245 in words is "twenty billion, one hundred twenty-three million, two hundred forty-three thousand, two hundred forty-five".