21457760

素因数分解:

$2^5\times 5^1\times {\mathrm{41}}^1\times {\mathrm{3271}}^1$

素因数の和:3327

約数の個数: 48

約数和(自身を含む): 51946272

約数和(自身を除く): 30488512

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 41, 80, 82, 160, 164, 205, 328, 410, 656, 820, 1312, 1640, 3271, 3280, 6542, 6560, 13084, 16355, 26168, 32710, 52336, 65420, 104672, 130840, 134111, 261680, 268222, 523360, 536444, 670555, 1072888, 1341110, 2145776, 2682220, 4291552, 5364440, 10728880, 21457760]

約数ペア:

[(1, 21457760), (2, 10728880), (4, 5364440), (5, 4291552), (8, 2682220), (10, 2145776), (16, 1341110), (20, 1072888), (32, 670555), (40, 536444), (41, 523360), (80, 268222), (82, 261680), (160, 134111), (164, 130840), (205, 104672), (328, 65420), (410, 52336), (656, 32710), (820, 26168), (1312, 16355), (1640, 13084), (3271, 6560), (3280, 6542)]