21740760 has 96 divisors (see below), whose sum is σ = 71351280. Its totient is φ = 5740800.

The previous prime is 21740753. The next prime is 21740767. The reversal of 21740760 is 6704712.

It is an interprime number because it is at equal distance from previous prime (21740753) and next prime (21740767).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21740767) 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, 46930 + ... + 47390.

Almost surely, 2^21740760 is an apocalyptic number.

21740760 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 21740760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35675640).

21740760 is an abundant number, since it is smaller than the sum of its proper divisors (49610520).

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

21740760 is a wasteful number, since it uses less digits than its factorization.

21740760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 21740760 is about 4662.6987893279. The cubic root of 21740760 is about 279.0989744044.

It can be divided in two parts, 21740 and 760, that added together give a square (22500 = 150²).

The spelling of 21740760 in words is "twenty-one million, seven hundred forty thousand, seven hundred sixty".