21000272975

素因数分解:

$5^2\times {\mathrm{11}}^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{21493}}^1$

素因数の和:21561

約数の個数: 72

約数和(自身を含む): 31903114320

約数和(自身を除く): 10902841345

約数列:

[1, 5, 11, 17, 19, 25, 55, 85, 95, 121, 187, 209, 275, 323, 425, 475, 605, 935, 1045, 1615, 2057, 2299, 3025, 3553, 4675, 5225, 8075, 10285, 11495, 17765, 21493, 39083, 51425, 57475, 88825, 107465, 195415, 236423, 365381, 408367, 537325, 977075, 1182115, 1826905, 2041835, 2600653, 4019191, 4492037, 5910575, 6942239, 9134525, 10209175, 13003265, 20095955, 22460185, 34711195, 44211101, 49412407, 65016325, 76364629, 100479775, 112300925, 173555975, 221055505, 247062035, 381823145, 840010919, 1105277525, 1235310175, 1909115725, 4200054595, 21000272975]

約数ペア:

[(1, 21000272975), (5, 4200054595), (11, 1909115725), (17, 1235310175), (19, 1105277525), (25, 840010919), (55, 381823145), (85, 247062035), (95, 221055505), (121, 173555975), (187, 112300925), (209, 100479775), (275, 76364629), (323, 65016325), (425, 49412407), (475, 44211101), (605, 34711195), (935, 22460185), (1045, 20095955), (1615, 13003265), (2057, 10209175), (2299, 9134525), (3025, 6942239), (3553, 5910575), (4675, 4492037), (5225, 4019191), (8075, 2600653), (10285, 2041835), (11495, 1826905), (17765, 1182115), (21493, 977075), (39083, 537325), (51425, 408367), (57475, 365381), (88825, 236423), (107465, 195415)]