About the Number

21748780

21748779 ← → 21748781

2進数表記:1010010111101110000101100

漢数字表記:二千百七十四万八千七百八十

素因数分解:

2 2 × 5 1 × 17 1 × 47 1 × 1361 1

素因数の和:1434
約数の個数: 48
約数和(自身を含む): 49424256
約数和(自身を除く): 27675476

約数列:
[1, 2, 4, 5, 10, 17, 20, 34, 47, 68, 85, 94, 170, 188, 235, 340, 470, 799, 940, 1361, 1598, 2722, 3196, 3995, 5444, 6805, 7990, 13610, 15980, 23137, 27220, 46274, 63967, 92548, 115685, 127934, 231370, 255868, 319835, 462740, 639670, 1087439, 1279340, 2174878, 4349756, 5437195, 10874390, 21748780]

約数ペア:
[(1, 21748780), (2, 10874390), (4, 5437195), (5, 4349756), (10, 2174878), (17, 1279340), (20, 1087439), (34, 639670), (47, 462740), (68, 319835), (85, 255868), (94, 231370), (170, 127934), (188, 115685), (235, 92548), (340, 63967), (470, 46274), (799, 27220), (940, 23137), (1361, 15980), (1598, 13610), (2722, 7990), (3196, 6805), (3995, 5444)]

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