21000907989

素因数分解:

$3^4\times {\mathrm{29}}^1\times {\mathrm{1787}}^1\times {\mathrm{5003}}^1$

素因数の和:6831

約数の個数: 40

約数和(自身を含む): 32478161760

約数和(自身を除く): 11477253771

約数列:

[1, 3, 9, 27, 29, 81, 87, 261, 783, 1787, 2349, 5003, 5361, 15009, 16083, 45027, 48249, 51823, 135081, 144747, 145087, 155469, 405243, 435261, 466407, 1305783, 1399221, 3917349, 4197663, 8940361, 11752047, 26821083, 80463249, 241389747, 259270469, 724169241, 777811407, 2333434221, 7000302663, 21000907989]

約数ペア:

[(1, 21000907989), (3, 7000302663), (9, 2333434221), (27, 777811407), (29, 724169241), (81, 259270469), (87, 241389747), (261, 80463249), (783, 26821083), (1787, 11752047), (2349, 8940361), (5003, 4197663), (5361, 3917349), (15009, 1399221), (16083, 1305783), (45027, 466407), (48249, 435261), (51823, 405243), (135081, 155469), (144747, 145087)]