28005720

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{73}}^1\times {\mathrm{139}}^1$

素因数の和:249

約数の個数: 128

約数和(自身を含む): 89510400

約数和(自身を除く): 61504680

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 23, 24, 30, 40, 46, 60, 69, 73, 92, 115, 120, 138, 139, 146, 184, 219, 230, 276, 278, 292, 345, 365, 417, 438, 460, 552, 556, 584, 690, 695, 730, 834, 876, 920, 1095, 1112, 1380, 1390, 1460, 1668, 1679, 1752, 2085, 2190, 2760, 2780, 2920, 3197, 3336, 3358, 4170, 4380, 5037, 5560, 6394, 6716, 8340, 8395, 8760, 9591, 10074, 10147, 12788, 13432, 15985, 16680, 16790, 19182, 20148, 20294, 25185, 25576, 30441, 31970, 33580, 38364, 40296, 40588, 47955, 50370, 50735, 60882, 63940, 67160, 76728, 81176, 95910, 100740, 101470, 121764, 127880, 152205, 191820, 201480, 202940, 233381, 243528, 304410, 383640, 405880, 466762, 608820, 700143, 933524, 1166905, 1217640, 1400286, 1867048, 2333810, 2800572, 3500715, 4667620, 5601144, 7001430, 9335240, 14002860, 28005720]

約数ペア:

[(1, 28005720), (2, 14002860), (3, 9335240), (4, 7001430), (5, 5601144), (6, 4667620), (8, 3500715), (10, 2800572), (12, 2333810), (15, 1867048), (20, 1400286), (23, 1217640), (24, 1166905), (30, 933524), (40, 700143), (46, 608820), (60, 466762), (69, 405880), (73, 383640), (92, 304410), (115, 243528), (120, 233381), (138, 202940), (139, 201480), (146, 191820), (184, 152205), (219, 127880), (230, 121764), (276, 101470), (278, 100740), (292, 95910), (345, 81176), (365, 76728), (417, 67160), (438, 63940), (460, 60882), (552, 50735), (556, 50370), (584, 47955), (690, 40588), (695, 40296), (730, 38364), (834, 33580), (876, 31970), (920, 30441), (1095, 25576), (1112, 25185), (1380, 20294), (1390, 20148), (1460, 19182), (1668, 16790), (1679, 16680), (1752, 15985), (2085, 13432), (2190, 12788), (2760, 10147), (2780, 10074), (2920, 9591), (3197, 8760), (3336, 8395), (3358, 8340), (4170, 6716), (4380, 6394), (5037, 5560)]