21015992

素因数分解:

$2^3\times {\mathrm{43}}^1\times {\mathrm{199}}^1\times {\mathrm{307}}^1$

素因数の和:555

約数の個数: 32

約数和(自身を含む): 40656000

約数和(自身を除く): 19640008

約数列:

[1, 2, 4, 8, 43, 86, 172, 199, 307, 344, 398, 614, 796, 1228, 1592, 2456, 8557, 13201, 17114, 26402, 34228, 52804, 61093, 68456, 105608, 122186, 244372, 488744, 2626999, 5253998, 10507996, 21015992]

約数ペア:

[(1, 21015992), (2, 10507996), (4, 5253998), (8, 2626999), (43, 488744), (86, 244372), (172, 122186), (199, 105608), (307, 68456), (344, 61093), (398, 52804), (614, 34228), (796, 26402), (1228, 17114), (1592, 13201), (2456, 8557)]