21978620

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{127}}^1\times {\mathrm{509}}^1$

素因数の和:662

約数の個数: 48

約数和(自身を含む): 49351680

約数和(自身を除く): 27373060

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 127, 170, 254, 340, 508, 509, 635, 1018, 1270, 2036, 2159, 2540, 2545, 4318, 5090, 8636, 8653, 10180, 10795, 17306, 21590, 34612, 43180, 43265, 64643, 86530, 129286, 173060, 258572, 323215, 646430, 1098931, 1292860, 2197862, 4395724, 5494655, 10989310, 21978620]

約数ペア:

[(1, 21978620), (2, 10989310), (4, 5494655), (5, 4395724), (10, 2197862), (17, 1292860), (20, 1098931), (34, 646430), (68, 323215), (85, 258572), (127, 173060), (170, 129286), (254, 86530), (340, 64643), (508, 43265), (509, 43180), (635, 34612), (1018, 21590), (1270, 17306), (2036, 10795), (2159, 10180), (2540, 8653), (2545, 8636), (4318, 5090)]