131220

素因数分解:

$2^2\times 3^8\times 5^1$

素因数の和:33

約数の個数: 54

約数和(自身を含む): 413322

約数和(自身を除く): 282102

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 81, 90, 108, 135, 162, 180, 243, 270, 324, 405, 486, 540, 729, 810, 972, 1215, 1458, 1620, 2187, 2430, 2916, 3645, 4374, 4860, 6561, 7290, 8748, 10935, 13122, 14580, 21870, 26244, 32805, 43740, 65610, 131220]

約数ペア:

[(1, 131220), (2, 65610), (3, 43740), (4, 32805), (5, 26244), (6, 21870), (9, 14580), (10, 13122), (12, 10935), (15, 8748), (18, 7290), (20, 6561), (27, 4860), (30, 4374), (36, 3645), (45, 2916), (54, 2430), (60, 2187), (81, 1620), (90, 1458), (108, 1215), (135, 972), (162, 810), (180, 729), (243, 540), (270, 486), (324, 405)]