21841520

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6659}}^1$

素因数の和:6713

約数の個数: 40

約数和(自身を含む): 52027920

約数和(自身を除く): 30186400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6659, 13318, 26636, 33295, 53272, 66590, 106544, 133180, 266360, 273019, 532720, 546038, 1092076, 1365095, 2184152, 2730190, 4368304, 5460380, 10920760, 21841520]

約数ペア:

[(1, 21841520), (2, 10920760), (4, 5460380), (5, 4368304), (8, 2730190), (10, 2184152), (16, 1365095), (20, 1092076), (40, 546038), (41, 532720), (80, 273019), (82, 266360), (164, 133180), (205, 106544), (328, 66590), (410, 53272), (656, 33295), (820, 26636), (1640, 13318), (3280, 6659)]