21006999475

素因数分解:

$5^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{251}}^1\times {\mathrm{6211}}^1$

素因数の和:6497

約数の個数: 72

約数和(自身を含む): 33193250496

約数和(自身を除く): 12186251021

約数列:

[1, 5, 7, 11, 25, 35, 49, 55, 77, 175, 245, 251, 275, 385, 539, 1225, 1255, 1757, 1925, 2695, 2761, 6211, 6275, 8785, 12299, 13475, 13805, 19327, 31055, 43477, 43925, 61495, 68321, 69025, 96635, 135289, 155275, 217385, 304339, 307475, 341605, 478247, 483175, 676445, 1086925, 1521695, 1558961, 1708025, 2391235, 3347729, 3382225, 7608475, 7794805, 10912727, 11956175, 16738645, 17148571, 38974025, 54563635, 76389089, 83693225, 85742855, 120039997, 272818175, 381945445, 428714275, 600199985, 840279979, 1909727225, 3000999925, 4201399895, 21006999475]

約数ペア:

[(1, 21006999475), (5, 4201399895), (7, 3000999925), (11, 1909727225), (25, 840279979), (35, 600199985), (49, 428714275), (55, 381945445), (77, 272818175), (175, 120039997), (245, 85742855), (251, 83693225), (275, 76389089), (385, 54563635), (539, 38974025), (1225, 17148571), (1255, 16738645), (1757, 11956175), (1925, 10912727), (2695, 7794805), (2761, 7608475), (6211, 3382225), (6275, 3347729), (8785, 2391235), (12299, 1708025), (13475, 1558961), (13805, 1521695), (19327, 1086925), (31055, 676445), (43477, 483175), (43925, 478247), (61495, 341605), (68321, 307475), (69025, 304339), (96635, 217385), (135289, 155275)]