21111280

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^2\times {\mathrm{43}}^1$

素因数の和:111

約数の個数: 120

約数和(自身を含む): 56125872

約数和(自身を除く): 35014592

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 19, 20, 34, 38, 40, 43, 68, 76, 80, 85, 86, 95, 136, 152, 170, 172, 190, 215, 272, 304, 323, 340, 344, 361, 380, 430, 646, 680, 688, 722, 731, 760, 817, 860, 1292, 1360, 1444, 1462, 1520, 1615, 1634, 1720, 1805, 2584, 2888, 2924, 3230, 3268, 3440, 3610, 3655, 4085, 5168, 5776, 5848, 6137, 6460, 6536, 7220, 7310, 8170, 11696, 12274, 12920, 13072, 13889, 14440, 14620, 15523, 16340, 24548, 25840, 27778, 28880, 29240, 30685, 31046, 32680, 49096, 55556, 58480, 61370, 62092, 65360, 69445, 77615, 98192, 111112, 122740, 124184, 138890, 155230, 222224, 245480, 248368, 263891, 277780, 310460, 490960, 527782, 555560, 620920, 1055564, 1111120, 1241840, 1319455, 2111128, 2638910, 4222256, 5277820, 10555640, 21111280]

約数ペア:

[(1, 21111280), (2, 10555640), (4, 5277820), (5, 4222256), (8, 2638910), (10, 2111128), (16, 1319455), (17, 1241840), (19, 1111120), (20, 1055564), (34, 620920), (38, 555560), (40, 527782), (43, 490960), (68, 310460), (76, 277780), (80, 263891), (85, 248368), (86, 245480), (95, 222224), (136, 155230), (152, 138890), (170, 124184), (172, 122740), (190, 111112), (215, 98192), (272, 77615), (304, 69445), (323, 65360), (340, 62092), (344, 61370), (361, 58480), (380, 55556), (430, 49096), (646, 32680), (680, 31046), (688, 30685), (722, 29240), (731, 28880), (760, 27778), (817, 25840), (860, 24548), (1292, 16340), (1360, 15523), (1444, 14620), (1462, 14440), (1520, 13889), (1615, 13072), (1634, 12920), (1720, 12274), (1805, 11696), (2584, 8170), (2888, 7310), (2924, 7220), (3230, 6536), (3268, 6460), (3440, 6137), (3610, 5848), (3655, 5776), (4085, 5168)]