21135790

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{199}}^1$

素因数の和:281

約数の個数: 64

約数和(自身を含む): 44352000

約数和(自身を除く): 23216210

約数列:

[1, 2, 5, 10, 13, 19, 26, 38, 43, 65, 86, 95, 130, 190, 199, 215, 247, 398, 430, 494, 559, 817, 995, 1118, 1235, 1634, 1990, 2470, 2587, 2795, 3781, 4085, 5174, 5590, 7562, 8170, 8557, 10621, 12935, 17114, 18905, 21242, 25870, 37810, 42785, 49153, 53105, 85570, 98306, 106210, 111241, 162583, 222482, 245765, 325166, 491530, 556205, 812915, 1112410, 1625830, 2113579, 4227158, 10567895, 21135790]

約数ペア:

[(1, 21135790), (2, 10567895), (5, 4227158), (10, 2113579), (13, 1625830), (19, 1112410), (26, 812915), (38, 556205), (43, 491530), (65, 325166), (86, 245765), (95, 222482), (130, 162583), (190, 111241), (199, 106210), (215, 98306), (247, 85570), (398, 53105), (430, 49153), (494, 42785), (559, 37810), (817, 25870), (995, 21242), (1118, 18905), (1235, 17114), (1634, 12935), (1990, 10621), (2470, 8557), (2587, 8170), (2795, 7562), (3781, 5590), (4085, 5174)]