21378775

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{17}}^2\times {\mathrm{269}}^1$

素因数の和:324

約数の個数: 36

約数和(自身を含む): 30835080

約数和(自身を除く): 9456305

約数列:

[1, 5, 11, 17, 25, 55, 85, 187, 269, 275, 289, 425, 935, 1345, 1445, 2959, 3179, 4573, 4675, 6725, 7225, 14795, 15895, 22865, 50303, 73975, 77741, 79475, 114325, 251515, 388705, 855151, 1257575, 1943525, 4275755, 21378775]

約数ペア:

[(1, 21378775), (5, 4275755), (11, 1943525), (17, 1257575), (25, 855151), (55, 388705), (85, 251515), (187, 114325), (269, 79475), (275, 77741), (289, 73975), (425, 50303), (935, 22865), (1345, 15895), (1445, 14795), (2959, 7225), (3179, 6725), (4573, 4675)]