21000886221

素因数分解:

$3^1\times 7^1\times {\mathrm{67}}^1\times {\mathrm{269}}^1\times {\mathrm{55487}}^1$

素因数の和:55833

約数の個数: 32

約数和(自身を含む): 32600309760

約数和(自身を除く): 11599423539

約数列:

[1, 3, 7, 21, 67, 201, 269, 469, 807, 1407, 1883, 5649, 18023, 54069, 55487, 126161, 166461, 378483, 388409, 1165227, 3717629, 11152887, 14926003, 26023403, 44778009, 78070209, 104482021, 313446063, 1000042201, 3000126603, 7000295407, 21000886221]

約数ペア:

[(1, 21000886221), (3, 7000295407), (7, 3000126603), (21, 1000042201), (67, 313446063), (201, 104482021), (269, 78070209), (469, 44778009), (807, 26023403), (1407, 14926003), (1883, 11152887), (5649, 3717629), (18023, 1165227), (54069, 388409), (55487, 378483), (126161, 166461)]