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20573 = 72939
BaseRepresentation
bin101000001011101
31001012222
411001131
51124243
6235125
7113660
oct50135
931188
1020573
1114503
12baa5
139497
1476d7
156168
hex505d

20573 has 4 divisors (see below), whose sum is σ = 23520. Its totient is φ = 17628.

The previous prime is 20563. The next prime is 20593. The reversal of 20573 is 37502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20573 - 26 = 20509 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1463 + ... + 1476.

It is an arithmetic number, because the mean of its divisors is an integer number (5880).

220573 is an apocalyptic number.

It is an amenable number.

20573 is a deficient number, since it is larger than the sum of its proper divisors (2947).

20573 is an equidigital number, since it uses as much as digits as its factorization.

20573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946.

The product of its (nonzero) digits is 210, while the sum is 17.

The square root of 20573 is about 143.4329111466. The cubic root of 20573 is about 27.4009660980.

Multiplying 20573 by its product of nonzero digits (210), we get a triangular number (4320330 = T2939).

The spelling of 20573 in words is "twenty thousand, five hundred seventy-three".

Divisors: 1 7 2939 20573