19900727

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{661}}^1$

素因数の和:719

約数の個数: 32

約数和(自身を含む): 27454464

約数和(自身を除く): 7553737

約数列:

[1, 7, 11, 17, 23, 77, 119, 161, 187, 253, 391, 661, 1309, 1771, 2737, 4301, 4627, 7271, 11237, 15203, 30107, 50897, 78659, 106421, 123607, 167233, 258451, 865249, 1170631, 1809157, 2842961, 19900727]

約数ペア:

[(1, 19900727), (7, 2842961), (11, 1809157), (17, 1170631), (23, 865249), (77, 258451), (119, 167233), (161, 123607), (187, 106421), (253, 78659), (391, 50897), (661, 30107), (1309, 15203), (1771, 11237), (2737, 7271), (4301, 4627)]