21011805

素因数分解:

$3^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{1789}}^1$

素因数の和:1835

約数の個数: 40

約数和(自身を含む): 38986200

約数和(自身を除く): 17974395

約数列:

[1, 3, 5, 9, 15, 27, 29, 45, 81, 87, 135, 145, 261, 405, 435, 783, 1305, 1789, 2349, 3915, 5367, 8945, 11745, 16101, 26835, 48303, 51881, 80505, 144909, 155643, 241515, 259405, 466929, 724545, 778215, 1400787, 2334645, 4202361, 7003935, 21011805]

約数ペア:

[(1, 21011805), (3, 7003935), (5, 4202361), (9, 2334645), (15, 1400787), (27, 778215), (29, 724545), (45, 466929), (81, 259405), (87, 241515), (135, 155643), (145, 144909), (261, 80505), (405, 51881), (435, 48303), (783, 26835), (1305, 16101), (1789, 11745), (2349, 8945), (3915, 5367)]