20381895

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{83}}^1\times {\mathrm{107}}^1$

素因数の和:221

約数の個数: 64

約数和(自身を含む): 39191040

約数和(自身を除く): 18809145

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 83, 85, 107, 135, 153, 249, 255, 321, 415, 459, 535, 747, 765, 963, 1245, 1411, 1605, 1819, 2241, 2295, 2889, 3735, 4233, 4815, 5457, 7055, 8881, 9095, 11205, 12699, 14445, 16371, 21165, 26643, 27285, 38097, 44405, 49113, 63495, 79929, 81855, 133215, 150977, 190485, 239787, 245565, 399645, 452931, 754885, 1198935, 1358793, 2264655, 4076379, 6793965, 20381895]

約数ペア:

[(1, 20381895), (3, 6793965), (5, 4076379), (9, 2264655), (15, 1358793), (17, 1198935), (27, 754885), (45, 452931), (51, 399645), (83, 245565), (85, 239787), (107, 190485), (135, 150977), (153, 133215), (249, 81855), (255, 79929), (321, 63495), (415, 49113), (459, 44405), (535, 38097), (747, 27285), (765, 26643), (963, 21165), (1245, 16371), (1411, 14445), (1605, 12699), (1819, 11205), (2241, 9095), (2295, 8881), (2889, 7055), (3735, 5457), (4233, 4815)]