261781485

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{109}}^1\times {\mathrm{257}}^1$

素因数の和:470

約数の個数: 64

約数和(自身を含む): 490406400

約数和(自身を除く): 228624915

約数列:

[1, 3, 5, 7, 15, 21, 35, 89, 105, 109, 257, 267, 327, 445, 545, 623, 763, 771, 1285, 1335, 1635, 1799, 1869, 2289, 3115, 3815, 3855, 5397, 8995, 9345, 9701, 11445, 22873, 26985, 28013, 29103, 48505, 67907, 68619, 84039, 114365, 140065, 145515, 160111, 196091, 203721, 339535, 343095, 420195, 480333, 588273, 800555, 980455, 1018605, 2401665, 2493157, 2941365, 7479471, 12465785, 17452099, 37397355, 52356297, 87260495, 261781485]

約数ペア:

[(1, 261781485), (3, 87260495), (5, 52356297), (7, 37397355), (15, 17452099), (21, 12465785), (35, 7479471), (89, 2941365), (105, 2493157), (109, 2401665), (257, 1018605), (267, 980455), (327, 800555), (445, 588273), (545, 480333), (623, 420195), (763, 343095), (771, 339535), (1285, 203721), (1335, 196091), (1635, 160111), (1799, 145515), (1869, 140065), (2289, 114365), (3115, 84039), (3815, 68619), (3855, 67907), (5397, 48505), (8995, 29103), (9345, 28013), (9701, 26985), (11445, 22873)]