21494840

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12497}}^1$

素因数の和:12551

約数の個数: 32

約数和(自身を含む): 49492080

約数和(自身を除く): 27997240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12497, 24994, 49988, 62485, 99976, 124970, 249940, 499880, 537371, 1074742, 2149484, 2686855, 4298968, 5373710, 10747420, 21494840]

約数ペア:

[(1, 21494840), (2, 10747420), (4, 5373710), (5, 4298968), (8, 2686855), (10, 2149484), (20, 1074742), (40, 537371), (43, 499880), (86, 249940), (172, 124970), (215, 99976), (344, 62485), (430, 49988), (860, 24994), (1720, 12497)]