20045140 has 12 divisors (see below), whose sum is σ = 42094836. Its totient is φ = 8018048.

The previous prime is 20045131. The next prime is 20045161. The reversal of 20045140 is 4154002.

It can be written as a sum of positive squares in 2 ways, for example, as 15776784 + 4268356 = 3972^2 + 2066^2 .

It is a zygodrome in base 7.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 501109 + ... + 501148.

It is an arithmetic number, because the mean of its divisors is an integer number (3507903).

Almost surely, 2^20045140 is an apocalyptic number.

20045140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20045140 is an abundant number, since it is smaller than the sum of its proper divisors (22049696).

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

20045140 is a wasteful number, since it uses less digits than its factorization.

20045140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002266 (or 1002264 counting only the distinct ones).

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

The square root of 20045140 is about 4477.1799159739. The cubic root of 20045140 is about 271.6458228997.

Adding to 20045140 its reverse (4154002), we get a palindrome (24199142).

The spelling of 20045140 in words is "twenty million, forty-five thousand, one hundred forty".