20521865

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{53}}^1$

素因数の和:138

約数の個数: 64

約数和(自身を含む): 33094656

約数和(自身を除く): 12572791

約数列:

[1, 5, 7, 13, 23, 35, 37, 53, 65, 91, 115, 161, 185, 259, 265, 299, 371, 455, 481, 689, 805, 851, 1219, 1295, 1495, 1855, 1961, 2093, 2405, 3367, 3445, 4255, 4823, 5957, 6095, 8533, 9805, 10465, 11063, 13727, 15847, 16835, 24115, 25493, 29785, 42665, 45103, 55315, 68635, 77441, 79235, 110929, 127465, 178451, 225515, 315721, 387205, 554645, 586339, 892255, 1578605, 2931695, 4104373, 20521865]

約数ペア:

[(1, 20521865), (5, 4104373), (7, 2931695), (13, 1578605), (23, 892255), (35, 586339), (37, 554645), (53, 387205), (65, 315721), (91, 225515), (115, 178451), (161, 127465), (185, 110929), (259, 79235), (265, 77441), (299, 68635), (371, 55315), (455, 45103), (481, 42665), (689, 29785), (805, 25493), (851, 24115), (1219, 16835), (1295, 15847), (1495, 13727), (1855, 11063), (1961, 10465), (2093, 9805), (2405, 8533), (3367, 6095), (3445, 5957), (4255, 4823)]