19979180

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{23}}^1\times {\mathrm{257}}^1$

素因数の和:315

約数の個数: 72

約数和(自身を含む): 47591712

約数和(自身を除く): 27612532

約数列:

[1, 2, 4, 5, 10, 13, 20, 23, 26, 46, 52, 65, 92, 115, 130, 169, 230, 257, 260, 299, 338, 460, 514, 598, 676, 845, 1028, 1196, 1285, 1495, 1690, 2570, 2990, 3341, 3380, 3887, 5140, 5911, 5980, 6682, 7774, 11822, 13364, 15548, 16705, 19435, 23644, 29555, 33410, 38870, 43433, 59110, 66820, 76843, 77740, 86866, 118220, 153686, 173732, 217165, 307372, 384215, 434330, 768430, 868660, 998959, 1536860, 1997918, 3995836, 4994795, 9989590, 19979180]

約数ペア:

[(1, 19979180), (2, 9989590), (4, 4994795), (5, 3995836), (10, 1997918), (13, 1536860), (20, 998959), (23, 868660), (26, 768430), (46, 434330), (52, 384215), (65, 307372), (92, 217165), (115, 173732), (130, 153686), (169, 118220), (230, 86866), (257, 77740), (260, 76843), (299, 66820), (338, 59110), (460, 43433), (514, 38870), (598, 33410), (676, 29555), (845, 23644), (1028, 19435), (1196, 16705), (1285, 15548), (1495, 13364), (1690, 11822), (2570, 7774), (2990, 6682), (3341, 5980), (3380, 5911), (3887, 5140)]