21647220

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{37}}^1\times {\mathrm{199}}^1$

素因数の和:262

約数の個数: 144

約数和(自身を含む): 72777600

約数和(自身を除く): 51130380

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 37, 42, 49, 60, 70, 74, 84, 98, 105, 111, 140, 147, 148, 185, 196, 199, 210, 222, 245, 259, 294, 370, 398, 420, 444, 490, 518, 555, 588, 597, 735, 740, 777, 796, 980, 995, 1036, 1110, 1194, 1295, 1393, 1470, 1554, 1813, 1990, 2220, 2388, 2590, 2786, 2940, 2985, 3108, 3626, 3885, 3980, 4179, 5180, 5439, 5572, 5970, 6965, 7252, 7363, 7770, 8358, 9065, 9751, 10878, 11940, 13930, 14726, 15540, 16716, 18130, 19502, 20895, 21756, 22089, 27195, 27860, 29253, 29452, 36260, 36815, 39004, 41790, 44178, 48755, 51541, 54390, 58506, 73630, 83580, 88356, 97510, 103082, 108780, 110445, 117012, 146265, 147260, 154623, 195020, 206164, 220890, 257705, 292530, 309246, 360787, 441780, 515410, 585060, 618492, 721574, 773115, 1030820, 1082361, 1443148, 1546230, 1803935, 2164722, 3092460, 3607870, 4329444, 5411805, 7215740, 10823610, 21647220]

約数ペア:

[(1, 21647220), (2, 10823610), (3, 7215740), (4, 5411805), (5, 4329444), (6, 3607870), (7, 3092460), (10, 2164722), (12, 1803935), (14, 1546230), (15, 1443148), (20, 1082361), (21, 1030820), (28, 773115), (30, 721574), (35, 618492), (37, 585060), (42, 515410), (49, 441780), (60, 360787), (70, 309246), (74, 292530), (84, 257705), (98, 220890), (105, 206164), (111, 195020), (140, 154623), (147, 147260), (148, 146265), (185, 117012), (196, 110445), (199, 108780), (210, 103082), (222, 97510), (245, 88356), (259, 83580), (294, 73630), (370, 58506), (398, 54390), (420, 51541), (444, 48755), (490, 44178), (518, 41790), (555, 39004), (588, 36815), (597, 36260), (735, 29452), (740, 29253), (777, 27860), (796, 27195), (980, 22089), (995, 21756), (1036, 20895), (1110, 19502), (1194, 18130), (1295, 16716), (1393, 15540), (1470, 14726), (1554, 13930), (1813, 11940), (1990, 10878), (2220, 9751), (2388, 9065), (2590, 8358), (2786, 7770), (2940, 7363), (2985, 7252), (3108, 6965), (3626, 5970), (3885, 5572), (3980, 5439), (4179, 5180)]