21520980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{541}}^1$

素因数の和:586

約数の個数: 144

約数和(自身を含む): 74574864

約数和(自身を除く): 53053884

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 15, 17, 18, 20, 26, 30, 34, 36, 39, 45, 51, 52, 60, 65, 68, 78, 85, 90, 102, 117, 130, 153, 156, 170, 180, 195, 204, 221, 234, 255, 260, 306, 340, 390, 442, 468, 510, 541, 585, 612, 663, 765, 780, 884, 1020, 1082, 1105, 1170, 1326, 1530, 1623, 1989, 2164, 2210, 2340, 2652, 2705, 3060, 3246, 3315, 3978, 4420, 4869, 5410, 6492, 6630, 7033, 7956, 8115, 9197, 9738, 9945, 10820, 13260, 14066, 16230, 18394, 19476, 19890, 21099, 24345, 27591, 28132, 32460, 35165, 36788, 39780, 42198, 45985, 48690, 55182, 63297, 70330, 82773, 84396, 91970, 97380, 105495, 110364, 119561, 126594, 137955, 140660, 165546, 183940, 210990, 239122, 253188, 275910, 316485, 331092, 358683, 413865, 421980, 478244, 551820, 597805, 632970, 717366, 827730, 1076049, 1195610, 1265940, 1434732, 1655460, 1793415, 2152098, 2391220, 3586830, 4304196, 5380245, 7173660, 10760490, 21520980]

約数ペア:

[(1, 21520980), (2, 10760490), (3, 7173660), (4, 5380245), (5, 4304196), (6, 3586830), (9, 2391220), (10, 2152098), (12, 1793415), (13, 1655460), (15, 1434732), (17, 1265940), (18, 1195610), (20, 1076049), (26, 827730), (30, 717366), (34, 632970), (36, 597805), (39, 551820), (45, 478244), (51, 421980), (52, 413865), (60, 358683), (65, 331092), (68, 316485), (78, 275910), (85, 253188), (90, 239122), (102, 210990), (117, 183940), (130, 165546), (153, 140660), (156, 137955), (170, 126594), (180, 119561), (195, 110364), (204, 105495), (221, 97380), (234, 91970), (255, 84396), (260, 82773), (306, 70330), (340, 63297), (390, 55182), (442, 48690), (468, 45985), (510, 42198), (541, 39780), (585, 36788), (612, 35165), (663, 32460), (765, 28132), (780, 27591), (884, 24345), (1020, 21099), (1082, 19890), (1105, 19476), (1170, 18394), (1326, 16230), (1530, 14066), (1623, 13260), (1989, 10820), (2164, 9945), (2210, 9738), (2340, 9197), (2652, 8115), (2705, 7956), (3060, 7033), (3246, 6630), (3315, 6492), (3978, 5410), (4420, 4869)]