81536980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{151}}^1$

素因数の和:222

約数の個数: 144

約数和(自身を含む): 218332800

約数和(自身を除く): 136795820

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 29, 35, 38, 49, 58, 70, 76, 95, 98, 116, 133, 140, 145, 151, 190, 196, 203, 245, 266, 290, 302, 380, 406, 490, 532, 551, 580, 604, 665, 755, 812, 931, 980, 1015, 1057, 1102, 1330, 1421, 1510, 1862, 2030, 2114, 2204, 2660, 2755, 2842, 2869, 3020, 3724, 3857, 4060, 4228, 4379, 4655, 5285, 5510, 5684, 5738, 7105, 7399, 7714, 8758, 9310, 10570, 11020, 11476, 14210, 14345, 14798, 15428, 17516, 18620, 19285, 20083, 21140, 21895, 26999, 28420, 28690, 29596, 30653, 36995, 38570, 40166, 43790, 53998, 57380, 61306, 73990, 77140, 80332, 83201, 87580, 100415, 107996, 122612, 134995, 140581, 147980, 153265, 166402, 200830, 214571, 269990, 281162, 306530, 332804, 401660, 416005, 429142, 539980, 562324, 582407, 613060, 702905, 832010, 858284, 1072855, 1164814, 1405810, 1664020, 2145710, 2329628, 2811620, 2912035, 4076849, 4291420, 5824070, 8153698, 11648140, 16307396, 20384245, 40768490, 81536980]

約数ペア:

[(1, 81536980), (2, 40768490), (4, 20384245), (5, 16307396), (7, 11648140), (10, 8153698), (14, 5824070), (19, 4291420), (20, 4076849), (28, 2912035), (29, 2811620), (35, 2329628), (38, 2145710), (49, 1664020), (58, 1405810), (70, 1164814), (76, 1072855), (95, 858284), (98, 832010), (116, 702905), (133, 613060), (140, 582407), (145, 562324), (151, 539980), (190, 429142), (196, 416005), (203, 401660), (245, 332804), (266, 306530), (290, 281162), (302, 269990), (380, 214571), (406, 200830), (490, 166402), (532, 153265), (551, 147980), (580, 140581), (604, 134995), (665, 122612), (755, 107996), (812, 100415), (931, 87580), (980, 83201), (1015, 80332), (1057, 77140), (1102, 73990), (1330, 61306), (1421, 57380), (1510, 53998), (1862, 43790), (2030, 40166), (2114, 38570), (2204, 36995), (2660, 30653), (2755, 29596), (2842, 28690), (2869, 28420), (3020, 26999), (3724, 21895), (3857, 21140), (4060, 20083), (4228, 19285), (4379, 18620), (4655, 17516), (5285, 15428), (5510, 14798), (5684, 14345), (5738, 14210), (7105, 11476), (7399, 11020), (7714, 10570), (8758, 9310)]