21491553

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{7951}}^1$

素因数の和:8024

約数の個数: 16

約数和(自身を含む): 30917376

約数和(自身を除く): 9425823

約数列:

[1, 3, 17, 51, 53, 159, 901, 2703, 7951, 23853, 135167, 405501, 421403, 1264209, 7163851, 21491553]

約数ペア:

[(1, 21491553), (3, 7163851), (17, 1264209), (51, 421403), (53, 405501), (159, 135167), (901, 23853), (2703, 7951)]