20744208 has 80 divisors (see below), whose sum is σ = 61504000. Its totient is φ = 6687360.

The previous prime is 20744173. The next prime is 20744231. The reversal of 20744208 is 80244702.

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

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, 12618 + ... + 14166.

It is an arithmetic number, because the mean of its divisors is an integer number (768800).

Almost surely, 2^20744208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20744208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30752000).

20744208 is an abundant number, since it is smaller than the sum of its proper divisors (40759792).

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

20744208 is a wasteful number, since it uses less digits than its factorization.

20744208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597 (or 1585 counting only the distinct ones).

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

The square root of 20744208 is about 4554.5809906071. The cubic root of 20744208 is about 274.7676627153.

The spelling of 20744208 in words is "twenty million, seven hundred forty-four thousand, two hundred eight".