21704680

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12619}}^1$

素因数の和:12673

約数の個数: 32

約数和(自身を含む): 49975200

約数和(自身を除く): 28270520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12619, 25238, 50476, 63095, 100952, 126190, 252380, 504760, 542617, 1085234, 2170468, 2713085, 4340936, 5426170, 10852340, 21704680]

約数ペア:

[(1, 21704680), (2, 10852340), (4, 5426170), (5, 4340936), (8, 2713085), (10, 2170468), (20, 1085234), (40, 542617), (43, 504760), (86, 252380), (172, 126190), (215, 100952), (344, 63095), (430, 50476), (860, 25238), (1720, 12619)]