20123005400 has 48 divisors (see below), whose sum is σ = 49538112840. Its totient is φ = 7575718400.

The previous prime is 20123005361. The next prime is 20123005403. The reversal of 20123005400 is 450032102.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123005403) 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 11 ways as a sum of consecutive naturals, for example, 2955866 + ... + 2962665.

Almost surely, 2^20123005400 is an apocalyptic number.

20123005400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20123005400 is an abundant number, since it is smaller than the sum of its proper divisors (29415107440).

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

20123005400 is a wasteful number, since it uses less digits than its factorization.

20123005400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5918564 (or 5918555 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

Adding to 20123005400 its reverse (450032102), we get a palindrome (20573037502).

The spelling of 20123005400 in words is "twenty billion, one hundred twenty-three million, five thousand, four hundred".