20202740 has 48 divisors (see below), whose sum is σ = 45505152. Its totient is φ = 7514496.

The previous prime is 20202697. The next prime is 20202751. The reversal of 20202740 is 4720202.

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 15 ways as a sum of consecutive naturals, for example, 16427 + ... + 17613.

It is an arithmetic number, because the mean of its divisors is an integer number (948024).

Almost surely, 2^20202740 is an apocalyptic number.

20202740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20202740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22752576).

20202740 is an abundant number, since it is smaller than the sum of its proper divisors (25302412).

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

20202740 is a wasteful number, since it uses less digits than its factorization.

20202740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256 (or 1254 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 20202740 is about 4494.7458215120. The cubic root of 20202740 is about 272.3558814843.

Adding to 20202740 its reverse (4720202), we get a palindrome (24922942).

The spelling of 20202740 in words is "twenty million, two hundred two thousand, seven hundred forty".