21290895

素因数分解:

$3^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{79}}^1\times {\mathrm{113}}^1$

素因数の和:256

約数の個数: 48

約数和(自身を含む): 38413440

約数和(自身を除く): 17122545

約数列:

[1, 3, 5, 9, 15, 45, 53, 79, 113, 159, 237, 265, 339, 395, 477, 565, 711, 795, 1017, 1185, 1695, 2385, 3555, 4187, 5085, 5989, 8927, 12561, 17967, 20935, 26781, 29945, 37683, 44635, 53901, 62805, 80343, 89835, 133905, 188415, 269505, 401715, 473131, 1419393, 2365655, 4258179, 7096965, 21290895]

約数ペア:

[(1, 21290895), (3, 7096965), (5, 4258179), (9, 2365655), (15, 1419393), (45, 473131), (53, 401715), (79, 269505), (113, 188415), (159, 133905), (237, 89835), (265, 80343), (339, 62805), (395, 53901), (477, 44635), (565, 37683), (711, 29945), (795, 26781), (1017, 20935), (1185, 17967), (1695, 12561), (2385, 8927), (3555, 5989), (4187, 5085)]