20512440

素因数分解:

$2^3\times 3^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{487}}^1$

素因数の和:523

約数の個数: 160

約数和(自身を含む): 74400480

約数和(自身を除く): 53888040

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 15, 18, 20, 24, 26, 27, 30, 36, 39, 40, 45, 52, 54, 60, 65, 72, 78, 81, 90, 104, 108, 117, 120, 130, 135, 156, 162, 180, 195, 216, 234, 260, 270, 312, 324, 351, 360, 390, 405, 468, 487, 520, 540, 585, 648, 702, 780, 810, 936, 974, 1053, 1080, 1170, 1404, 1461, 1560, 1620, 1755, 1948, 2106, 2340, 2435, 2808, 2922, 3240, 3510, 3896, 4212, 4383, 4680, 4870, 5265, 5844, 6331, 7020, 7305, 8424, 8766, 9740, 10530, 11688, 12662, 13149, 14040, 14610, 17532, 18993, 19480, 21060, 21915, 25324, 26298, 29220, 31655, 35064, 37986, 39447, 42120, 43830, 50648, 52596, 56979, 58440, 63310, 65745, 75972, 78894, 87660, 94965, 105192, 113958, 126620, 131490, 151944, 157788, 170937, 175320, 189930, 197235, 227916, 253240, 262980, 284895, 315576, 341874, 379860, 394470, 455832, 512811, 525960, 569790, 683748, 759720, 788940, 854685, 1025622, 1139580, 1367496, 1577880, 1709370, 2051244, 2279160, 2564055, 3418740, 4102488, 5128110, 6837480, 10256220, 20512440]

約数ペア:

[(1, 20512440), (2, 10256220), (3, 6837480), (4, 5128110), (5, 4102488), (6, 3418740), (8, 2564055), (9, 2279160), (10, 2051244), (12, 1709370), (13, 1577880), (15, 1367496), (18, 1139580), (20, 1025622), (24, 854685), (26, 788940), (27, 759720), (30, 683748), (36, 569790), (39, 525960), (40, 512811), (45, 455832), (52, 394470), (54, 379860), (60, 341874), (65, 315576), (72, 284895), (78, 262980), (81, 253240), (90, 227916), (104, 197235), (108, 189930), (117, 175320), (120, 170937), (130, 157788), (135, 151944), (156, 131490), (162, 126620), (180, 113958), (195, 105192), (216, 94965), (234, 87660), (260, 78894), (270, 75972), (312, 65745), (324, 63310), (351, 58440), (360, 56979), (390, 52596), (405, 50648), (468, 43830), (487, 42120), (520, 39447), (540, 37986), (585, 35064), (648, 31655), (702, 29220), (780, 26298), (810, 25324), (936, 21915), (974, 21060), (1053, 19480), (1080, 18993), (1170, 17532), (1404, 14610), (1461, 14040), (1560, 13149), (1620, 12662), (1755, 11688), (1948, 10530), (2106, 9740), (2340, 8766), (2435, 8424), (2808, 7305), (2922, 7020), (3240, 6331), (3510, 5844), (3896, 5265), (4212, 4870), (4383, 4680)]