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20489453 = 37553769
BaseRepresentation
bin100111000101…
…0010011101101
31102112222020122
41032022103231
520221130303
62011054325
7336105005
oct116122355
942488218
1020489453
1110625036
126a413a5
13432514a
142a15005
151beae38
hex138a4ed

20489453 has 4 divisors (see below), whose sum is σ = 21043260. Its totient is φ = 19935648.

The previous prime is 20489431. The next prime is 20489477. The reversal of 20489453 is 35498402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35498402 = 217749201.

It can be written as a sum of positive squares in 2 ways, for example, as 11710084 + 8779369 = 3422^2 + 2963^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20489453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276848 + ... + 276921.

It is an arithmetic number, because the mean of its divisors is an integer number (5260815).

Almost surely, 220489453 is an apocalyptic number.

It is an amenable number.

20489453 is a deficient number, since it is larger than the sum of its proper divisors (553807).

20489453 is an equidigital number, since it uses as much as digits as its factorization.

20489453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553806.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20489453 is about 4526.5276979159. The cubic root of 20489453 is about 273.6382397918.

The spelling of 20489453 in words is "twenty million, four hundred eighty-nine thousand, four hundred fifty-three".

Divisors: 1 37 553769 20489453