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20560340 = 2251028017
BaseRepresentation
bin100111001101…
…1100111010100
31102200120111002
41032123213110
520230412330
62012402432
7336521453
oct116334724
942616432
1020560340
1110673319
126a76418
13434b4a8
142a32b9a
151c11e45
hex139b9d4

20560340 has 12 divisors (see below), whose sum is σ = 43176756. Its totient is φ = 8224128.

The previous prime is 20560339. The next prime is 20560369. The reversal of 20560340 is 4306502.

It can be written as a sum of positive squares in 2 ways, for example, as 8042896 + 12517444 = 2836^2 + 3538^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1028017 = 20560340 / (2 + 0 + 5 + 6 + 0 + 3 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513989 + ... + 514028.

It is an arithmetic number, because the mean of its divisors is an integer number (3598063).

Almost surely, 220560340 is an apocalyptic number.

20560340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20560340 is an abundant number, since it is smaller than the sum of its proper divisors (22616416).

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

20560340 is a wasteful number, since it uses less digits than its factorization.

20560340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028026 (or 1028024 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20560340 is about 4534.3511112396. The cubic root of 20560340 is about 273.9534437034.

Adding to 20560340 its reverse (4306502), we get a palindrome (24866842).

The spelling of 20560340 in words is "twenty million, five hundred sixty thousand, three hundred forty".

Divisors: 1 2 4 5 10 20 1028017 2056034 4112068 5140085 10280170 20560340