20253140 has 12 divisors (see below), whose sum is σ = 42531636. Its totient is φ = 8101248.

The previous prime is 20253127. The next prime is 20253161. The reversal of 20253140 is 4135202.

It can be written as a sum of positive squares in 2 ways, for example, as 6130576 + 14122564 = 2476^2 + 3758^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506309 + ... + 506348.

It is an arithmetic number, because the mean of its divisors is an integer number (3544303).

Almost surely, 2^20253140 is an apocalyptic number.

20253140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20253140 is an abundant number, since it is smaller than the sum of its proper divisors (22278496).

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

20253140 is a wasteful number, since it uses less digits than its factorization.

20253140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012666 (or 1012664 counting only the distinct ones).

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

The square root of 20253140 is about 4500.3488753651. The cubic root of 20253140 is about 272.5821764897.

Adding to 20253140 its reverse (4135202), we get a palindrome (24388342).

The spelling of 20253140 in words is "twenty million, two hundred fifty-three thousand, one hundred forty".