21406825

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{241}}^1$

素因数の和:298

約数の個数: 48

約数和(自身を含む): 32408640

約数和(自身を除く): 11001815

約数列:

[1, 5, 11, 17, 19, 25, 55, 85, 95, 187, 209, 241, 275, 323, 425, 475, 935, 1045, 1205, 1615, 2651, 3553, 4097, 4579, 4675, 5225, 6025, 8075, 13255, 17765, 20485, 22895, 45067, 50369, 66275, 77843, 88825, 102425, 114475, 225335, 251845, 389215, 856273, 1126675, 1259225, 1946075, 4281365, 21406825]

約数ペア:

[(1, 21406825), (5, 4281365), (11, 1946075), (17, 1259225), (19, 1126675), (25, 856273), (55, 389215), (85, 251845), (95, 225335), (187, 114475), (209, 102425), (241, 88825), (275, 77843), (323, 66275), (425, 50369), (475, 45067), (935, 22895), (1045, 20485), (1205, 17765), (1615, 13255), (2651, 8075), (3553, 6025), (4097, 5225), (4579, 4675)]