20743740 has 72 divisors (see below), whose sum is σ = 66633840. Its totient is φ = 5205504.

The previous prime is 20743739. The next prime is 20743747. The reversal of 20743740 is 4734702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20743747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330 + ... + 6449.

It is an arithmetic number, because the mean of its divisors is an integer number (925470).

Almost surely, 2^20743740 is an apocalyptic number.

20743740 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 20743740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33316920).

20743740 is an abundant number, since it is smaller than the sum of its proper divisors (45890100).

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

20743740 is a wasteful number, since it uses less digits than its factorization.

20743740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6811 (or 6806 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 20743740 is about 4554.5296134727. The cubic root of 20743740 is about 274.7655963998.

The spelling of 20743740 in words is "twenty million, seven hundred forty-three thousand, seven hundred forty".