20987884

素因数分解:

$2^2\times {\mathrm{67}}^1\times {\mathrm{71}}^1\times {\mathrm{1103}}^1$

素因数の和:1245

約数の個数: 24

約数和(自身を含む): 37836288

約数和(自身を除く): 16848404

約数列:

[1, 2, 4, 67, 71, 134, 142, 268, 284, 1103, 2206, 4412, 4757, 9514, 19028, 73901, 78313, 147802, 156626, 295604, 313252, 5246971, 10493942, 20987884]

約数ペア:

[(1, 20987884), (2, 10493942), (4, 5246971), (67, 313252), (71, 295604), (134, 156626), (142, 147802), (268, 78313), (284, 73901), (1103, 19028), (2206, 9514), (4412, 4757)]