19804720

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{139}}^1$

素因数の和:302

約数の個数: 80

約数和(自身を含む): 50309280

約数和(自身を除く): 30504560

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 137, 139, 208, 260, 274, 278, 520, 548, 556, 685, 695, 1040, 1096, 1112, 1370, 1390, 1781, 1807, 2192, 2224, 2740, 2780, 3562, 3614, 5480, 5560, 7124, 7228, 8905, 9035, 10960, 11120, 14248, 14456, 17810, 18070, 19043, 28496, 28912, 35620, 36140, 38086, 71240, 72280, 76172, 95215, 142480, 144560, 152344, 190430, 247559, 304688, 380860, 495118, 761720, 990236, 1237795, 1523440, 1980472, 2475590, 3960944, 4951180, 9902360, 19804720]

約数ペア:

[(1, 19804720), (2, 9902360), (4, 4951180), (5, 3960944), (8, 2475590), (10, 1980472), (13, 1523440), (16, 1237795), (20, 990236), (26, 761720), (40, 495118), (52, 380860), (65, 304688), (80, 247559), (104, 190430), (130, 152344), (137, 144560), (139, 142480), (208, 95215), (260, 76172), (274, 72280), (278, 71240), (520, 38086), (548, 36140), (556, 35620), (685, 28912), (695, 28496), (1040, 19043), (1096, 18070), (1112, 17810), (1370, 14456), (1390, 14248), (1781, 11120), (1807, 10960), (2192, 9035), (2224, 8905), (2740, 7228), (2780, 7124), (3562, 5560), (3614, 5480)]