20123144357 has 8 divisors (see below), whose sum is σ = 20508152184. Its totient is φ = 19738333888.

The previous prime is 20123144347. The next prime is 20123144369. The reversal of 20123144357 is 75344132102.

It can be written as a sum of positive squares in 4 ways, for example, as 1788359521 + 18334784836 = 42289^2 + 135406^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20123144357 - 2²² = 20118950053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123144317) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 165383 + ... + 259995.

It is an arithmetic number, because the mean of its divisors is an integer number (2563519023).

Almost surely, 2^20123144357 is an apocalyptic number.

It is an amenable number.

20123144357 is a deficient number, since it is larger than the sum of its proper divisors (385007827).

20123144357 is an equidigital number, since it uses as much as digits as its factorization.

20123144357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98679.

The product of its (nonzero) digits is 20160, while the sum is 32.

Adding to 20123144357 its reverse (75344132102), we get a palindrome (95467276459).

The spelling of 20123144357 in words is "twenty billion, one hundred twenty-three million, one hundred forty-four thousand, three hundred fifty-seven".