21181808

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{69677}}^1$

素因数の和:69704

約数の個数: 20

約数和(自身を含む): 43200360

約数和(自身を除く): 22018552

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 152, 304, 69677, 139354, 278708, 557416, 1114832, 1323863, 2647726, 5295452, 10590904, 21181808]

約数ペア:

[(1, 21181808), (2, 10590904), (4, 5295452), (8, 2647726), (16, 1323863), (19, 1114832), (38, 557416), (76, 278708), (152, 139354), (304, 69677)]