21288778

素因数分解:

$2^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{163}}^1\times {\mathrm{491}}^1$

素因数の和:682

約数の個数: 32

約数和(自身を含む): 38730240

約数和(自身を除く): 17441462

約数列:

[1, 2, 7, 14, 19, 38, 133, 163, 266, 326, 491, 982, 1141, 2282, 3097, 3437, 6194, 6874, 9329, 18658, 21679, 43358, 65303, 80033, 130606, 160066, 560231, 1120462, 1520627, 3041254, 10644389, 21288778]

約数ペア:

[(1, 21288778), (2, 10644389), (7, 3041254), (14, 1520627), (19, 1120462), (38, 560231), (133, 160066), (163, 130606), (266, 80033), (326, 65303), (491, 43358), (982, 21679), (1141, 18658), (2282, 9329), (3097, 6874), (3437, 6194)]