20454720 has 224 divisors, whose sum is σ = 76809600. Its totient is φ = 4546560.

The previous prime is 20454691. The next prime is 20454739. The reversal of 20454720 is 2745402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137206 + ... + 137354.

It is an arithmetic number, because the mean of its divisors is an integer number (342900).

Almost surely, 2^20454720 is an apocalyptic number.

20454720 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 20454720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38404800).

20454720 is an abundant number, since it is smaller than the sum of its proper divisors (56354880).

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

20454720 is a wasteful number, since it uses less digits than its factorization.

20454720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 20454720 is about 4522.6894653513. The cubic root of 20454720 is about 273.4835317007.

The spelling of 20454720 in words is "twenty million, four hundred fifty-four thousand, seven hundred twenty".