20640785

素因数分解:

$5^1\times {\mathrm{11}}^2\times {\mathrm{109}}^1\times {\mathrm{313}}^1$

素因数の和:449

約数の個数: 24

約数和(自身を含む): 27562920

約数和(自身を除く): 6922135

約数列:

[1, 5, 11, 55, 109, 121, 313, 545, 605, 1199, 1565, 3443, 5995, 13189, 17215, 34117, 37873, 65945, 170585, 189365, 375287, 1876435, 4128157, 20640785]

約数ペア:

[(1, 20640785), (5, 4128157), (11, 1876435), (55, 375287), (109, 189365), (121, 170585), (313, 65945), (545, 37873), (605, 34117), (1199, 17215), (1565, 13189), (3443, 5995)]