21621985

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{113}}^1$

素因数の和:214

約数の個数: 48

約数和(自身を含む): 33685632

約数和(自身を除く): 12063647

約数列:

[1, 5, 7, 11, 35, 49, 55, 71, 77, 113, 245, 355, 385, 497, 539, 565, 781, 791, 1243, 2485, 2695, 3479, 3905, 3955, 5467, 5537, 6215, 8023, 8701, 17395, 27335, 27685, 38269, 40115, 43505, 56161, 60907, 88253, 191345, 280805, 304535, 393127, 441265, 617771, 1965635, 3088855, 4324397, 21621985]

約数ペア:

[(1, 21621985), (5, 4324397), (7, 3088855), (11, 1965635), (35, 617771), (49, 441265), (55, 393127), (71, 304535), (77, 280805), (113, 191345), (245, 88253), (355, 60907), (385, 56161), (497, 43505), (539, 40115), (565, 38269), (781, 27685), (791, 27335), (1243, 17395), (2485, 8701), (2695, 8023), (3479, 6215), (3905, 5537), (3955, 5467)]