21206128

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{883}}^1$

素因数の和:989

約数の個数: 40

約数和(自身を含む): 43846400

約数和(自身を除く): 22640272

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 79, 152, 158, 304, 316, 632, 883, 1264, 1501, 1766, 3002, 3532, 6004, 7064, 12008, 14128, 16777, 24016, 33554, 67108, 69757, 134216, 139514, 268432, 279028, 558056, 1116112, 1325383, 2650766, 5301532, 10603064, 21206128]

約数ペア:

[(1, 21206128), (2, 10603064), (4, 5301532), (8, 2650766), (16, 1325383), (19, 1116112), (38, 558056), (76, 279028), (79, 268432), (152, 139514), (158, 134216), (304, 69757), (316, 67108), (632, 33554), (883, 24016), (1264, 16777), (1501, 14128), (1766, 12008), (3002, 7064), (3532, 6004)]