21760560 has 60 divisors (see below), whose sum is σ = 73081632. Its totient is φ = 5802624.

The previous prime is 21760559. The next prime is 21760579. The reversal of 21760560 is 6506712.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14392 + ... + 15831.

Almost surely, 2^21760560 is an apocalyptic number.

21760560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21760560 is an abundant number, since it is smaller than the sum of its proper divisors (51321072).

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

21760560 is a wasteful number, since it uses less digits than its factorization.

21760560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30242 (or 30233 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 21760560 is about 4664.8215399949. The cubic root of 21760560 is about 279.1836767933.

The spelling of 21760560 in words is "twenty-one million, seven hundred sixty thousand, five hundred sixty".