21404838

素因数分解:

$2^1\times 3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{197}}^1\times {\mathrm{199}}^1$

素因数の和:421

約数の個数: 64

約数和(自身を含む): 53222400

約数和(自身を除く): 31817562

約数列:

[1, 2, 3, 6, 7, 13, 14, 21, 26, 39, 42, 78, 91, 182, 197, 199, 273, 394, 398, 546, 591, 597, 1182, 1194, 1379, 1393, 2561, 2587, 2758, 2786, 4137, 4179, 5122, 5174, 7683, 7761, 8274, 8358, 15366, 15522, 17927, 18109, 35854, 36218, 39203, 53781, 54327, 78406, 107562, 108654, 117609, 235218, 274421, 509639, 548842, 823263, 1019278, 1528917, 1646526, 3057834, 3567473, 7134946, 10702419, 21404838]

約数ペア:

[(1, 21404838), (2, 10702419), (3, 7134946), (6, 3567473), (7, 3057834), (13, 1646526), (14, 1528917), (21, 1019278), (26, 823263), (39, 548842), (42, 509639), (78, 274421), (91, 235218), (182, 117609), (197, 108654), (199, 107562), (273, 78406), (394, 54327), (398, 53781), (546, 39203), (591, 36218), (597, 35854), (1182, 18109), (1194, 17927), (1379, 15522), (1393, 15366), (2561, 8358), (2587, 8274), (2758, 7761), (2786, 7683), (4137, 5174), (4179, 5122)]