20922280

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1$

素因数の和:274

約数の個数: 64

約数和(自身を含む): 48988800

約数和(自身を除く): 28066520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 71, 106, 139, 142, 212, 265, 278, 284, 355, 424, 530, 556, 568, 695, 710, 1060, 1112, 1390, 1420, 2120, 2780, 2840, 3763, 5560, 7367, 7526, 9869, 14734, 15052, 18815, 19738, 29468, 30104, 36835, 37630, 39476, 49345, 58936, 73670, 75260, 78952, 98690, 147340, 150520, 197380, 294680, 394760, 523057, 1046114, 2092228, 2615285, 4184456, 5230570, 10461140, 20922280]

約数ペア:

[(1, 20922280), (2, 10461140), (4, 5230570), (5, 4184456), (8, 2615285), (10, 2092228), (20, 1046114), (40, 523057), (53, 394760), (71, 294680), (106, 197380), (139, 150520), (142, 147340), (212, 98690), (265, 78952), (278, 75260), (284, 73670), (355, 58936), (424, 49345), (530, 39476), (556, 37630), (568, 36835), (695, 30104), (710, 29468), (1060, 19738), (1112, 18815), (1390, 15052), (1420, 14734), (2120, 9869), (2780, 7526), (2840, 7367), (3763, 5560)]