21736080 has 160 divisors (see below), whose sum is σ = 77673600. Its totient is φ = 5580288.

The previous prime is 21736067. The next prime is 21736093. The reversal of 21736080 is 8063712.

It is an interprime number because it is at equal distance from previous prime (21736067) and next prime (21736093).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62467 + ... + 62813.

It is an arithmetic number, because the mean of its divisors is an integer number (485460).

Almost surely, 2^21736080 is an apocalyptic number.

21736080 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 21736080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38836800).

21736080 is an abundant number, since it is smaller than the sum of its proper divisors (55937520).

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

21736080 is a wasteful number, since it uses less digits than its factorization.

21736080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21736080 is about 4662.1969070386. The cubic root of 21736080 is about 279.0789463260.

Adding to 21736080 its reverse (8063712), we get a palindrome (29799792).

The spelling of 21736080 in words is "twenty-one million, seven hundred thirty-six thousand, eighty".