20400003123 has 8 divisors (see below), whose sum is σ = 27200832768. Its totient is φ = 13599587784.

The previous prime is 20400003121. The next prime is 20400003241. The reversal of 20400003123 is 32130000402.

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

It is not a de Polignac number, because 20400003123 - 2¹ = 20400003121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20400003121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39586 + ... + 205832.

It is an arithmetic number, because the mean of its divisors is an integer number (3400104096).

Almost surely, 2^20400003123 is an apocalyptic number.

20400003123 is a deficient number, since it is larger than the sum of its proper divisors (6800829645).

20400003123 is a wasteful number, since it uses less digits than its factorization.

20400003123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207153.

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 20400003123 its reverse (32130000402), we get a palindrome (52530003525).

The spelling of 20400003123 in words is "twenty billion, four hundred million, three thousand, one hundred twenty-three".