638702128

素因数分解:

$2^4\times {\mathrm{997}}^1\times {\mathrm{40039}}^1$

素因数の和:41044

約数の個数: 20

約数和(自身を含む): 1238757520

約数和(自身を除く): 600055392

約数列:

[1, 2, 4, 8, 16, 997, 1994, 3988, 7976, 15952, 40039, 80078, 160156, 320312, 640624, 39918883, 79837766, 159675532, 319351064, 638702128]

約数ペア:

[(1, 638702128), (2, 319351064), (4, 159675532), (8, 79837766), (16, 39918883), (997, 640624), (1994, 320312), (3988, 160156), (7976, 80078), (15952, 40039)]