20213921

素因数分解:

$7^2\times {\mathrm{13}}^2\times {\mathrm{2441}}^1$

素因数の和:2481

約数の個数: 18

約数和(自身を含む): 25472502

約数和(自身を除く): 5258581

約数列:

[1, 7, 13, 49, 91, 169, 637, 1183, 2441, 8281, 17087, 31733, 119609, 222131, 412529, 1554917, 2887703, 20213921]

約数ペア:

[(1, 20213921), (7, 2887703), (13, 1554917), (49, 412529), (91, 222131), (169, 119609), (637, 31733), (1183, 17087), (2441, 8281)]