21247840

素因数分解:

$2^5\times 5^1\times {\mathrm{41}}^2\times {\mathrm{79}}^1$

素因数の和:176

約数の個数: 72

約数和(自身を含む): 52103520

約数和(自身を除く): 30855680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 41, 79, 80, 82, 158, 160, 164, 205, 316, 328, 395, 410, 632, 656, 790, 820, 1264, 1312, 1580, 1640, 1681, 2528, 3160, 3239, 3280, 3362, 6320, 6478, 6560, 6724, 8405, 12640, 12956, 13448, 16195, 16810, 25912, 26896, 32390, 33620, 51824, 53792, 64780, 67240, 103648, 129560, 132799, 134480, 259120, 265598, 268960, 518240, 531196, 663995, 1062392, 1327990, 2124784, 2655980, 4249568, 5311960, 10623920, 21247840]

約数ペア:

[(1, 21247840), (2, 10623920), (4, 5311960), (5, 4249568), (8, 2655980), (10, 2124784), (16, 1327990), (20, 1062392), (32, 663995), (40, 531196), (41, 518240), (79, 268960), (80, 265598), (82, 259120), (158, 134480), (160, 132799), (164, 129560), (205, 103648), (316, 67240), (328, 64780), (395, 53792), (410, 51824), (632, 33620), (656, 32390), (790, 26896), (820, 25912), (1264, 16810), (1312, 16195), (1580, 13448), (1640, 12956), (1681, 12640), (2528, 8405), (3160, 6724), (3239, 6560), (3280, 6478), (3362, 6320)]