20145400 has 48 divisors (see below), whose sum is σ = 51101640. Its totient is φ = 7324800.

The previous prime is 20145397. The next prime is 20145403. The reversal of 20145400 is 454102.

It is an interprime number because it is at equal distance from previous prime (20145397) and next prime (20145403).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145403) 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 11 ways as a sum of consecutive naturals, for example, 2379 + ... + 6778.

Almost surely, 2^20145400 is an apocalyptic number.

20145400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145400 is an abundant number, since it is smaller than the sum of its proper divisors (30956240).

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

20145400 is a wasteful number, since it uses less digits than its factorization.

20145400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9184 (or 9175 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20145400 is about 4488.3627304397. The cubic root of 20145400 is about 272.0979678819.

Adding to 20145400 its reverse (454102), we get a palindrome (20599502).

The spelling of 20145400 in words is "twenty million, one hundred forty-five thousand, four hundred".