21736480 has 48 divisors (see below), whose sum is σ = 52083864. Its totient is φ = 8570880.

The previous prime is 21736469. The next prime is 21736483. The reversal of 21736480 is 8463712.

It can be written as a sum of positive squares in 4 ways, for example, as 10419984 + 11316496 = 3228^2 + 3364^2 .

It is not an unprimeable number, because it can be changed into a prime (21736483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10750 + ... + 12610.

Almost surely, 2^21736480 is an apocalyptic number.

21736480 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 21736480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26041932).

21736480 is an abundant number, since it is smaller than the sum of its proper divisors (30347384).

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

21736480 is a wasteful number, since it uses less digits than its factorization.

21736480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949 (or 1941 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21736480 is about 4662.2398050722. The cubic root of 21736480 is about 279.0806582399.

The spelling of 21736480 in words is "twenty-one million, seven hundred thirty-six thousand, four hundred eighty".