20753140 has 12 divisors (see below), whose sum is σ = 43581636. Its totient is φ = 8301248.

The previous prime is 20753129. The next prime is 20753143. The reversal of 20753140 is 4135702.

It can be written as a sum of positive squares in 2 ways, for example, as 12027024 + 8726116 = 3468^2 + 2954^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20753143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518809 + ... + 518848.

It is an arithmetic number, because the mean of its divisors is an integer number (3631803).

Almost surely, 2^20753140 is an apocalyptic number.

20753140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20753140 is an abundant number, since it is smaller than the sum of its proper divisors (22828496).

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

20753140 is a wasteful number, since it uses less digits than its factorization.

20753140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037666 (or 1037664 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20753140 is about 4555.5614363106. The cubic root of 20753140 is about 274.8070933619.

Adding to 20753140 its reverse (4135702), we get a palindrome (24888842).

The spelling of 20753140 in words is "twenty million, seven hundred fifty-three thousand, one hundred forty".