20145100 has 18 divisors (see below), whose sum is σ = 43715084. Its totient is φ = 8058000.

The previous prime is 20145089. The next prime is 20145107. The reversal of 20145100 is 154102.

It is not an unprimeable number, because it can be changed into a prime (20145107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100626 + ... + 100825.

Almost surely, 2^20145100 is an apocalyptic number.

20145100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145100 is an abundant number, since it is smaller than the sum of its proper divisors (23569984).

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

20145100 is a wasteful number, since it uses less digits than its factorization.

20145100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201465 (or 201458 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20145100 is about 4488.3293105564. The cubic root of 20145100 is about 272.0966172048.

Adding to 20145100 its reverse (154102), we get a palindrome (20299202).

The spelling of 20145100 in words is "twenty million, one hundred forty-five thousand, one hundred".