1620

素因数分解:

$2^2\times 3^4\times 5^1$

素因数の和:21

約数の個数: 30

約数和(自身を含む): 5082

約数和(自身を除く): 3462

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, 270, 324, 405, 540, 810, 1620]

約数ペア:

[(1, 1620), (2, 810), (3, 540), (4, 405), (5, 324), (6, 270), (9, 180), (10, 162), (12, 135), (15, 108), (18, 90), (20, 81), (27, 60), (30, 54), (36, 45)]