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20736000 = 2113453

20736000 has 240 divisors, whose sum is σ = 77297220. Its totient is φ = 5529600.

The previous prime is 20735969. The next prime is 20736017. The reversal of 20736000 is 63702.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Jordan-Polya number, since it can be written as 6! ⋅ (5!)2 ⋅ 2!.

It can be written as a sum of positive squares in 2 ways, for example, as 14017536 + 6718464 = 3744^2 + 2592^2 .

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4147198 + ... + 4147202.

Almost surely, 220736000 is an apocalyptic number.

20736000 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 20736000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38648610).

20736000 is an abundant number, since it is smaller than the sum of its proper divisors (56561220).

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

20736000 is an frugal number, since it uses more digits than its factorization.

20736000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 20736000 is about 4553.6798306425. The cubic root of 20736000 is about 274.7314182128.

Multiplying 20736000 by its sum of digits (18), we get a cube (373248000 = 7203).

Adding to 20736000 its reverse (63702), we get a palindrome (20799702).

The spelling of 20736000 in words is "twenty million, seven hundred thirty-six thousand".