21281220

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{191}}^1\times {\mathrm{619}}^1$

素因数の和:825

約数の個数: 72

約数和(自身を含む): 64995840

約数和(自身を除く): 43714620

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 191, 382, 573, 619, 764, 955, 1146, 1238, 1719, 1857, 1910, 2292, 2476, 2865, 3095, 3438, 3714, 3820, 5571, 5730, 6190, 6876, 7428, 8595, 9285, 11142, 11460, 12380, 17190, 18570, 22284, 27855, 34380, 37140, 55710, 111420, 118229, 236458, 354687, 472916, 591145, 709374, 1064061, 1182290, 1418748, 1773435, 2128122, 2364580, 3546870, 4256244, 5320305, 7093740, 10640610, 21281220]

約数ペア:

[(1, 21281220), (2, 10640610), (3, 7093740), (4, 5320305), (5, 4256244), (6, 3546870), (9, 2364580), (10, 2128122), (12, 1773435), (15, 1418748), (18, 1182290), (20, 1064061), (30, 709374), (36, 591145), (45, 472916), (60, 354687), (90, 236458), (180, 118229), (191, 111420), (382, 55710), (573, 37140), (619, 34380), (764, 27855), (955, 22284), (1146, 18570), (1238, 17190), (1719, 12380), (1857, 11460), (1910, 11142), (2292, 9285), (2476, 8595), (2865, 7428), (3095, 6876), (3438, 6190), (3714, 5730), (3820, 5571)]