21860480 has 32 divisors (see below), whose sum is σ = 52261740. Its totient is φ = 8743936.

The previous prime is 21860479. The next prime is 21860483. The reversal of 21860480 is 8406812.

It can be written as a sum of positive squares in 2 ways, for example, as 21752896 + 107584 = 4664^2 + 328^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (21860483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16439 + ... + 17718.

Almost surely, 2^21860480 is an apocalyptic number.

21860480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21860480 is an abundant number, since it is smaller than the sum of its proper divisors (30401260).

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

21860480 is an equidigital number, since it uses as much as digits as its factorization.

21860480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34176 (or 34164 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 21860480 is about 4675.5192225035. The cubic root of 21860480 is about 279.6103423443.

The spelling of 21860480 in words is "twenty-one million, eight hundred sixty thousand, four hundred eighty".