1980100

素因数分解:

$2^2\times 5^2\times {\mathrm{19801}}^1$

素因数の和:19815

約数の個数: 18

約数和(自身を含む): 4297034

約数和(自身を除く): 2316934

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 19801, 39602, 79204, 99005, 198010, 396020, 495025, 990050, 1980100]

約数ペア:

[(1, 1980100), (2, 990050), (4, 495025), (5, 396020), (10, 198010), (20, 99005), (25, 79204), (50, 39602), (100, 19801)]