81242720

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{281}}^1$

素因数の和:448

約数の個数: 96

約数和(自身を含む): 208928160

約数和(自身を除く): 127685440

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 139, 160, 208, 260, 278, 281, 416, 520, 556, 562, 695, 1040, 1112, 1124, 1390, 1405, 1807, 2080, 2224, 2248, 2780, 2810, 3614, 3653, 4448, 4496, 5560, 5620, 7228, 7306, 8992, 9035, 11120, 11240, 14456, 14612, 18070, 18265, 22240, 22480, 28912, 29224, 36140, 36530, 39059, 44960, 57824, 58448, 72280, 73060, 78118, 116896, 144560, 146120, 156236, 195295, 289120, 292240, 312472, 390590, 507767, 584480, 624944, 781180, 1015534, 1249888, 1562360, 2031068, 2538835, 3124720, 4062136, 5077670, 6249440, 8124272, 10155340, 16248544, 20310680, 40621360, 81242720]

約数ペア:

[(1, 81242720), (2, 40621360), (4, 20310680), (5, 16248544), (8, 10155340), (10, 8124272), (13, 6249440), (16, 5077670), (20, 4062136), (26, 3124720), (32, 2538835), (40, 2031068), (52, 1562360), (65, 1249888), (80, 1015534), (104, 781180), (130, 624944), (139, 584480), (160, 507767), (208, 390590), (260, 312472), (278, 292240), (281, 289120), (416, 195295), (520, 156236), (556, 146120), (562, 144560), (695, 116896), (1040, 78118), (1112, 73060), (1124, 72280), (1390, 58448), (1405, 57824), (1807, 44960), (2080, 39059), (2224, 36530), (2248, 36140), (2780, 29224), (2810, 28912), (3614, 22480), (3653, 22240), (4448, 18265), (4496, 18070), (5560, 14612), (5620, 14456), (7228, 11240), (7306, 11120), (8992, 9035)]