20724480 has 216 divisors, whose sum is σ = 82266912. Its totient is φ = 4718592.

The previous prime is 20724467. The next prime is 20724491. The reversal of 20724480 is 8442702.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80512 + ... + 80768.

Almost surely, 2^20724480 is an apocalyptic number.

20724480 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 20724480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41133456).

20724480 is an abundant number, since it is smaller than the sum of its proper divisors (61542432).

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

20724480 is a wasteful number, since it uses less digits than its factorization.

20724480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20724480 is about 4552.4147438475. The cubic root of 20724480 is about 274.6805325998.

The spelling of 20724480 in words is "twenty million, seven hundred twenty-four thousand, four hundred eighty".