21105760

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{139}}^1$

素因数の和:240

約数の個数: 96

約数和(自身を含む): 54825120

約数和(自身を除く): 33719360

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 73, 80, 104, 130, 139, 146, 160, 208, 260, 278, 292, 365, 416, 520, 556, 584, 695, 730, 949, 1040, 1112, 1168, 1390, 1460, 1807, 1898, 2080, 2224, 2336, 2780, 2920, 3614, 3796, 4448, 4745, 5560, 5840, 7228, 7592, 9035, 9490, 10147, 11120, 11680, 14456, 15184, 18070, 18980, 20294, 22240, 28912, 30368, 36140, 37960, 40588, 50735, 57824, 72280, 75920, 81176, 101470, 131911, 144560, 151840, 162352, 202940, 263822, 289120, 324704, 405880, 527644, 659555, 811760, 1055288, 1319110, 1623520, 2110576, 2638220, 4221152, 5276440, 10552880, 21105760]

約数ペア:

[(1, 21105760), (2, 10552880), (4, 5276440), (5, 4221152), (8, 2638220), (10, 2110576), (13, 1623520), (16, 1319110), (20, 1055288), (26, 811760), (32, 659555), (40, 527644), (52, 405880), (65, 324704), (73, 289120), (80, 263822), (104, 202940), (130, 162352), (139, 151840), (146, 144560), (160, 131911), (208, 101470), (260, 81176), (278, 75920), (292, 72280), (365, 57824), (416, 50735), (520, 40588), (556, 37960), (584, 36140), (695, 30368), (730, 28912), (949, 22240), (1040, 20294), (1112, 18980), (1168, 18070), (1390, 15184), (1460, 14456), (1807, 11680), (1898, 11120), (2080, 10147), (2224, 9490), (2336, 9035), (2780, 7592), (2920, 7228), (3614, 5840), (3796, 5560), (4448, 4745)]