21691257

素因数分解:

$3^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{19489}}^1$

素因数の和:19552

約数の個数: 16

約数和(自身を含む): 33678720

約数和(自身を除く): 11987463

約数列:

[1, 3, 7, 21, 53, 159, 371, 1113, 19489, 58467, 136423, 409269, 1032917, 3098751, 7230419, 21691257]

約数ペア:

[(1, 21691257), (3, 7230419), (7, 3098751), (21, 1032917), (53, 409269), (159, 136423), (371, 58467), (1113, 19489)]