20721980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{1033}}^1$

素因数の和:1118

約数の個数: 48

約数和(自身を含む): 46902240

約数和(自身を除く): 26180260

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 59, 68, 85, 118, 170, 236, 295, 340, 590, 1003, 1033, 1180, 2006, 2066, 4012, 4132, 5015, 5165, 10030, 10330, 17561, 20060, 20660, 35122, 60947, 70244, 87805, 121894, 175610, 243788, 304735, 351220, 609470, 1036099, 1218940, 2072198, 4144396, 5180495, 10360990, 20721980]

約数ペア:

[(1, 20721980), (2, 10360990), (4, 5180495), (5, 4144396), (10, 2072198), (17, 1218940), (20, 1036099), (34, 609470), (59, 351220), (68, 304735), (85, 243788), (118, 175610), (170, 121894), (236, 87805), (295, 70244), (340, 60947), (590, 35122), (1003, 20660), (1033, 20060), (1180, 17561), (2006, 10330), (2066, 10030), (4012, 5165), (4132, 5015)]