20740020 has 192 divisors, whose sum is σ = 73543680. Its totient is φ = 4257792.

The previous prime is 20740009. The next prime is 20740021. The reversal of 20740020 is 2004702.

20740020 is a nontrivial binomial coefficient, being equal to C(6441, 2).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20740021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 183484 + ... + 183596.

It is an arithmetic number, because the mean of its divisors is an integer number (383040).

Almost surely, 2^20740020 is an apocalyptic number.

20740020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

20740020 is the 6440-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20740020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36771840).

20740020 is an abundant number, since it is smaller than the sum of its proper divisors (52803660).

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

20740020 is a wasteful number, since it uses less digits than its factorization.

20740020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 20740020 is about 4554.1212105081. The cubic root of 20740020 is about 274.7491707356.

Adding to 20740020 its reverse (2004702), we get a palindrome (22744722).

The spelling of 20740020 in words is "twenty million, seven hundred forty thousand, twenty".