20517980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{233}}^1$

素因数の和:303

約数の個数: 96

約数和(自身を含む): 53778816

約数和(自身を除く): 33260836

約数列:

[1, 2, 4, 5, 7, 10, 14, 17, 20, 28, 34, 35, 37, 68, 70, 74, 85, 119, 140, 148, 170, 185, 233, 238, 259, 340, 370, 466, 476, 518, 595, 629, 740, 932, 1036, 1165, 1190, 1258, 1295, 1631, 2330, 2380, 2516, 2590, 3145, 3262, 3961, 4403, 4660, 5180, 6290, 6524, 7922, 8155, 8621, 8806, 12580, 15844, 16310, 17242, 17612, 19805, 22015, 27727, 32620, 34484, 39610, 43105, 44030, 55454, 60347, 79220, 86210, 88060, 110908, 120694, 138635, 146557, 172420, 241388, 277270, 293114, 301735, 554540, 586228, 603470, 732785, 1025899, 1206940, 1465570, 2051798, 2931140, 4103596, 5129495, 10258990, 20517980]

約数ペア:

[(1, 20517980), (2, 10258990), (4, 5129495), (5, 4103596), (7, 2931140), (10, 2051798), (14, 1465570), (17, 1206940), (20, 1025899), (28, 732785), (34, 603470), (35, 586228), (37, 554540), (68, 301735), (70, 293114), (74, 277270), (85, 241388), (119, 172420), (140, 146557), (148, 138635), (170, 120694), (185, 110908), (233, 88060), (238, 86210), (259, 79220), (340, 60347), (370, 55454), (466, 44030), (476, 43105), (518, 39610), (595, 34484), (629, 32620), (740, 27727), (932, 22015), (1036, 19805), (1165, 17612), (1190, 17242), (1258, 16310), (1295, 15844), (1631, 12580), (2330, 8806), (2380, 8621), (2516, 8155), (2590, 7922), (3145, 6524), (3262, 6290), (3961, 5180), (4403, 4660)]