21213909

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{2273}}^1$

素因数の和:2357

約数の個数: 24

約数和(自身を含む): 32991192

約数和(自身を除く): 11777283

約数列:

[1, 3, 9, 17, 51, 61, 153, 183, 549, 1037, 2273, 3111, 6819, 9333, 20457, 38641, 115923, 138653, 347769, 415959, 1247877, 2357101, 7071303, 21213909]

約数ペア:

[(1, 21213909), (3, 7071303), (9, 2357101), (17, 1247877), (51, 415959), (61, 347769), (153, 138653), (183, 115923), (549, 38641), (1037, 20457), (2273, 9333), (3111, 6819)]