21980490

素因数分解:

$2^1\times 3^1\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{131}}^1$

素因数の和:212

約数の個数: 128

約数和(自身を含む): 65691648

約数和(自身を除く): 43711158

約数列:

[1, 2, 3, 5, 6, 7, 10, 14, 15, 17, 21, 30, 34, 35, 42, 47, 51, 70, 85, 94, 102, 105, 119, 131, 141, 170, 210, 235, 238, 255, 262, 282, 329, 357, 393, 470, 510, 595, 655, 658, 705, 714, 786, 799, 917, 987, 1190, 1310, 1410, 1598, 1645, 1785, 1834, 1965, 1974, 2227, 2397, 2751, 3290, 3570, 3930, 3995, 4454, 4585, 4794, 4935, 5502, 5593, 6157, 6681, 7990, 9170, 9870, 11135, 11186, 11985, 12314, 13362, 13755, 15589, 16779, 18471, 22270, 23970, 27510, 27965, 30785, 31178, 33405, 33558, 36942, 43099, 46767, 55930, 61570, 66810, 77945, 83895, 86198, 92355, 93534, 104669, 129297, 155890, 167790, 184710, 209338, 215495, 233835, 258594, 314007, 430990, 467670, 523345, 628014, 646485, 732683, 1046690, 1292970, 1465366, 1570035, 2198049, 3140070, 3663415, 4396098, 7326830, 10990245, 21980490]

約数ペア:

[(1, 21980490), (2, 10990245), (3, 7326830), (5, 4396098), (6, 3663415), (7, 3140070), (10, 2198049), (14, 1570035), (15, 1465366), (17, 1292970), (21, 1046690), (30, 732683), (34, 646485), (35, 628014), (42, 523345), (47, 467670), (51, 430990), (70, 314007), (85, 258594), (94, 233835), (102, 215495), (105, 209338), (119, 184710), (131, 167790), (141, 155890), (170, 129297), (210, 104669), (235, 93534), (238, 92355), (255, 86198), (262, 83895), (282, 77945), (329, 66810), (357, 61570), (393, 55930), (470, 46767), (510, 43099), (595, 36942), (655, 33558), (658, 33405), (705, 31178), (714, 30785), (786, 27965), (799, 27510), (917, 23970), (987, 22270), (1190, 18471), (1310, 16779), (1410, 15589), (1598, 13755), (1645, 13362), (1785, 12314), (1834, 11985), (1965, 11186), (1974, 11135), (2227, 9870), (2397, 9170), (2751, 7990), (3290, 6681), (3570, 6157), (3930, 5593), (3995, 5502), (4454, 4935), (4585, 4794)]