21178040

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{293}}^1$

素因数の和:456

約数の個数: 64

約数和(自身を含む): 51861600

約数和(自身を除く): 30683560

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 139, 260, 278, 293, 520, 556, 586, 695, 1112, 1172, 1390, 1465, 1807, 2344, 2780, 2930, 3614, 3809, 5560, 5860, 7228, 7618, 9035, 11720, 14456, 15236, 18070, 19045, 30472, 36140, 38090, 40727, 72280, 76180, 81454, 152360, 162908, 203635, 325816, 407270, 529451, 814540, 1058902, 1629080, 2117804, 2647255, 4235608, 5294510, 10589020, 21178040]

約数ペア:

[(1, 21178040), (2, 10589020), (4, 5294510), (5, 4235608), (8, 2647255), (10, 2117804), (13, 1629080), (20, 1058902), (26, 814540), (40, 529451), (52, 407270), (65, 325816), (104, 203635), (130, 162908), (139, 152360), (260, 81454), (278, 76180), (293, 72280), (520, 40727), (556, 38090), (586, 36140), (695, 30472), (1112, 19045), (1172, 18070), (1390, 15236), (1465, 14456), (1807, 11720), (2344, 9035), (2780, 7618), (2930, 7228), (3614, 5860), (3809, 5560)]