20985965

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{599}}^1$

素因数の和:642

約数の個数: 48

約数和(自身を含む): 34473600

約数和(自身を除く): 13487635

約数列:

[1, 5, 7, 11, 13, 35, 49, 55, 65, 77, 91, 143, 245, 385, 455, 539, 599, 637, 715, 1001, 2695, 2995, 3185, 4193, 5005, 6589, 7007, 7787, 20965, 29351, 32945, 35035, 38935, 46123, 54509, 85657, 146755, 230615, 272545, 322861, 381563, 428285, 599599, 1614305, 1907815, 2997995, 4197193, 20985965]

約数ペア:

[(1, 20985965), (5, 4197193), (7, 2997995), (11, 1907815), (13, 1614305), (35, 599599), (49, 428285), (55, 381563), (65, 322861), (77, 272545), (91, 230615), (143, 146755), (245, 85657), (385, 54509), (455, 46123), (539, 38935), (599, 35035), (637, 32945), (715, 29351), (1001, 20965), (2695, 7787), (2995, 7007), (3185, 6589), (4193, 5005)]