21007980

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{16673}}^1$

素因数の和:16695

約数の個数: 72

約数和(自身を含む): 72832032

約数和(自身を除く): 51824052

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260, 16673, 33346, 50019, 66692, 83365, 100038, 116711, 150057, 166730, 200076, 233422, 250095, 300114, 333460, 350133, 466844, 500190, 583555, 600228, 700266, 750285, 1000380, 1050399, 1167110, 1400532, 1500570, 1750665, 2100798, 2334220, 3001140, 3501330, 4201596, 5251995, 7002660, 10503990, 21007980]

約数ペア:

[(1, 21007980), (2, 10503990), (3, 7002660), (4, 5251995), (5, 4201596), (6, 3501330), (7, 3001140), (9, 2334220), (10, 2100798), (12, 1750665), (14, 1500570), (15, 1400532), (18, 1167110), (20, 1050399), (21, 1000380), (28, 750285), (30, 700266), (35, 600228), (36, 583555), (42, 500190), (45, 466844), (60, 350133), (63, 333460), (70, 300114), (84, 250095), (90, 233422), (105, 200076), (126, 166730), (140, 150057), (180, 116711), (210, 100038), (252, 83365), (315, 66692), (420, 50019), (630, 33346), (1260, 16673)]