12990440

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{89}}^2$

素因数の和:230

約数の個数: 48

約数和(自身を含む): 30281580

約数和(自身を除く): 17291140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 89, 164, 178, 205, 328, 356, 410, 445, 712, 820, 890, 1640, 1780, 3560, 3649, 7298, 7921, 14596, 15842, 18245, 29192, 31684, 36490, 39605, 63368, 72980, 79210, 145960, 158420, 316840, 324761, 649522, 1299044, 1623805, 2598088, 3247610, 6495220, 12990440]

約数ペア:

[(1, 12990440), (2, 6495220), (4, 3247610), (5, 2598088), (8, 1623805), (10, 1299044), (20, 649522), (40, 324761), (41, 316840), (82, 158420), (89, 145960), (164, 79210), (178, 72980), (205, 63368), (328, 39605), (356, 36490), (410, 31684), (445, 29192), (712, 18245), (820, 15842), (890, 14596), (1640, 7921), (1780, 7298), (3560, 3649)]