21696981

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{53}}^1\times {\mathrm{349}}^1$

素因数の和:445

約数の個数: 32

約数和(自身を含む): 32659200

約数和(自身を除く): 10962219

約数列:

[1, 3, 17, 23, 51, 53, 69, 159, 349, 391, 901, 1047, 1173, 1219, 2703, 3657, 5933, 8027, 17799, 18497, 20723, 24081, 55491, 62169, 136459, 314449, 409377, 425431, 943347, 1276293, 7232327, 21696981]

約数ペア:

[(1, 21696981), (3, 7232327), (17, 1276293), (23, 943347), (51, 425431), (53, 409377), (69, 314449), (159, 136459), (349, 62169), (391, 55491), (901, 24081), (1047, 20723), (1173, 18497), (1219, 17799), (2703, 8027), (3657, 5933)]