21996480 has 112 divisors (see below), whose sum is σ = 76224384. Its totient is φ = 5329920.

The previous prime is 21996473. The next prime is 21996493. The reversal of 21996480 is 8469912.

It is a super-3 number, since 3×21996480³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9519 + ... + 11601.

Almost surely, 2^21996480 is an apocalyptic number.

21996480 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 21996480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38112192).

21996480 is an abundant number, since it is smaller than the sum of its proper divisors (54227904).

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

21996480 is a wasteful number, since it uses less digits than its factorization.

21996480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114 (or 2104 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 21996480 is about 4690.0405115521. The cubic root of 21996480 is about 280.1889880587.

The spelling of 21996480 in words is "twenty-one million, nine hundred ninety-six thousand, four hundred eighty".