21507928

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{206807}}^1$

素因数の和:206826

約数の個数: 16

約数和(自身を含む): 43429680

約数和(自身を除く): 21921752

約数列:

[1, 2, 4, 8, 13, 26, 52, 104, 206807, 413614, 827228, 1654456, 2688491, 5376982, 10753964, 21507928]

約数ペア:

[(1, 21507928), (2, 10753964), (4, 5376982), (8, 2688491), (13, 1654456), (26, 827228), (52, 413614), (104, 206807)]