21172221

素因数分解:

$3^2\times 7^1\times {\mathrm{83}}^1\times {\mathrm{4049}}^1$

素因数の和:4145

約数の個数: 24

約数和(自身を含む): 35380800

約数和(自身を除く): 14208579

約数列:

[1, 3, 7, 9, 21, 63, 83, 249, 581, 747, 1743, 4049, 5229, 12147, 28343, 36441, 85029, 255087, 336067, 1008201, 2352469, 3024603, 7057407, 21172221]

約数ペア:

[(1, 21172221), (3, 7057407), (7, 3024603), (9, 2352469), (21, 1008201), (63, 336067), (83, 255087), (249, 85029), (581, 36441), (747, 28343), (1743, 12147), (4049, 5229)]