20040123120400 has 60 divisors (see below), whose sum is σ = 49447649773732. Its totient is φ = 7799399262720.

The previous prime is 20040123120383. The next prime is 20040123120403. The reversal of 20040123120400 is 402132104002.

It can be written as a sum of positive squares in 6 ways, for example, as 194488056064 + 19845635064336 = 441008^2 + 4454844^2 .

It is not an unprimeable number, because it can be changed into a prime (20040123120403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 677016387 + ... + 677045986.

Almost surely, 2^{20040123120400} is an apocalyptic number.

20040123120400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20040123120400 is an abundant number, since it is smaller than the sum of its proper divisors (29407526653332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20040123120400 is a wasteful number, since it uses less digits than its factorization.

20040123120400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354062428 (or 1354062417 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20040123120400 its reverse (402132104002), we get a palindrome (20442255224402).

The spelling of 20040123120400 in words is "twenty trillion, forty billion, one hundred twenty-three million, one hundred twenty thousand, four hundred".