21257320

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{31}}^2\times {\mathrm{79}}^1$

素因数の和:159

約数の個数: 96

約数和(自身を含む): 57196800

約数和(自身を除く): 35939480

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 31, 35, 40, 56, 62, 70, 79, 124, 140, 155, 158, 217, 248, 280, 310, 316, 395, 434, 553, 620, 632, 790, 868, 961, 1085, 1106, 1240, 1580, 1736, 1922, 2170, 2212, 2449, 2765, 3160, 3844, 4340, 4424, 4805, 4898, 5530, 6727, 7688, 8680, 9610, 9796, 11060, 12245, 13454, 17143, 19220, 19592, 22120, 24490, 26908, 33635, 34286, 38440, 48980, 53816, 67270, 68572, 75919, 85715, 97960, 134540, 137144, 151838, 171430, 269080, 303676, 342860, 379595, 531433, 607352, 685720, 759190, 1062866, 1518380, 2125732, 2657165, 3036760, 4251464, 5314330, 10628660, 21257320]

約数ペア:

[(1, 21257320), (2, 10628660), (4, 5314330), (5, 4251464), (7, 3036760), (8, 2657165), (10, 2125732), (14, 1518380), (20, 1062866), (28, 759190), (31, 685720), (35, 607352), (40, 531433), (56, 379595), (62, 342860), (70, 303676), (79, 269080), (124, 171430), (140, 151838), (155, 137144), (158, 134540), (217, 97960), (248, 85715), (280, 75919), (310, 68572), (316, 67270), (395, 53816), (434, 48980), (553, 38440), (620, 34286), (632, 33635), (790, 26908), (868, 24490), (961, 22120), (1085, 19592), (1106, 19220), (1240, 17143), (1580, 13454), (1736, 12245), (1922, 11060), (2170, 9796), (2212, 9610), (2449, 8680), (2765, 7688), (3160, 6727), (3844, 5530), (4340, 4898), (4424, 4805)]