21381555

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{199}}^1$

素因数の和:268

約数の個数: 64

約数和(自身を含む): 40320000

約数和(自身を除く): 18938445

約数列:

[1, 3, 5, 13, 15, 19, 29, 39, 57, 65, 87, 95, 145, 195, 199, 247, 285, 377, 435, 551, 597, 741, 995, 1131, 1235, 1653, 1885, 2587, 2755, 2985, 3705, 3781, 5655, 5771, 7163, 7761, 8265, 11343, 12935, 17313, 18905, 21489, 28855, 35815, 38805, 49153, 56715, 75023, 86565, 107445, 109649, 147459, 225069, 245765, 328947, 375115, 548245, 737295, 1125345, 1425437, 1644735, 4276311, 7127185, 21381555]

約数ペア:

[(1, 21381555), (3, 7127185), (5, 4276311), (13, 1644735), (15, 1425437), (19, 1125345), (29, 737295), (39, 548245), (57, 375115), (65, 328947), (87, 245765), (95, 225069), (145, 147459), (195, 109649), (199, 107445), (247, 86565), (285, 75023), (377, 56715), (435, 49153), (551, 38805), (597, 35815), (741, 28855), (995, 21489), (1131, 18905), (1235, 17313), (1653, 12935), (1885, 11343), (2587, 8265), (2755, 7761), (2985, 7163), (3705, 5771), (3781, 5655)]