21286251

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{17783}}^1$

素因数の和:17815

約数の個数: 24

約数和(自身を含む): 36990720

約数和(自身を除く): 15704469

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 133, 171, 399, 1197, 17783, 53349, 124481, 160047, 337877, 373443, 1013631, 1120329, 2365139, 3040893, 7095417, 21286251]

約数ペア:

[(1, 21286251), (3, 7095417), (7, 3040893), (9, 2365139), (19, 1120329), (21, 1013631), (57, 373443), (63, 337877), (133, 160047), (171, 124481), (399, 53349), (1197, 17783)]