21249220

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{199}}^1\times {\mathrm{281}}^1$

素因数の和:508

約数の個数: 48

約数和(自身を含む): 47376000

約数和(自身を除く): 26126780

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 199, 281, 380, 398, 562, 796, 995, 1124, 1405, 1990, 2810, 3781, 3980, 5339, 5620, 7562, 10678, 15124, 18905, 21356, 26695, 37810, 53390, 55919, 75620, 106780, 111838, 223676, 279595, 559190, 1062461, 1118380, 2124922, 4249844, 5312305, 10624610, 21249220]

約数ペア:

[(1, 21249220), (2, 10624610), (4, 5312305), (5, 4249844), (10, 2124922), (19, 1118380), (20, 1062461), (38, 559190), (76, 279595), (95, 223676), (190, 111838), (199, 106780), (281, 75620), (380, 55919), (398, 53390), (562, 37810), (796, 26695), (995, 21356), (1124, 18905), (1405, 15124), (1990, 10678), (2810, 7562), (3781, 5620), (3980, 5339)]