21615891

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{727}}^1$

素因数の和:811

約数の個数: 32

約数和(自身を含む): 33965568

約数和(自身を除く): 12349677

約数列:

[1, 3, 11, 17, 33, 51, 53, 159, 187, 561, 583, 727, 901, 1749, 2181, 2703, 7997, 9911, 12359, 23991, 29733, 37077, 38531, 115593, 135949, 407847, 423841, 655027, 1271523, 1965081, 7205297, 21615891]

約数ペア:

[(1, 21615891), (3, 7205297), (11, 1965081), (17, 1271523), (33, 655027), (51, 423841), (53, 407847), (159, 135949), (187, 115593), (561, 38531), (583, 37077), (727, 29733), (901, 23991), (1749, 12359), (2181, 9911), (2703, 7997)]