21531656

素因数分解:

$2^3\times {\mathrm{17}}^2\times {\mathrm{67}}^1\times {\mathrm{139}}^1$

素因数の和:246

約数の個数: 48

約数和(自身を含む): 43839600

約数和(自身を除く): 22307944

約数列:

[1, 2, 4, 8, 17, 34, 67, 68, 134, 136, 139, 268, 278, 289, 536, 556, 578, 1112, 1139, 1156, 2278, 2312, 2363, 4556, 4726, 9112, 9313, 9452, 18626, 18904, 19363, 37252, 38726, 40171, 74504, 77452, 80342, 154904, 158321, 160684, 316642, 321368, 633284, 1266568, 2691457, 5382914, 10765828, 21531656]

約数ペア:

[(1, 21531656), (2, 10765828), (4, 5382914), (8, 2691457), (17, 1266568), (34, 633284), (67, 321368), (68, 316642), (134, 160684), (136, 158321), (139, 154904), (268, 80342), (278, 77452), (289, 74504), (536, 40171), (556, 38726), (578, 37252), (1112, 19363), (1139, 18904), (1156, 18626), (2278, 9452), (2312, 9313), (2363, 9112), (4556, 4726)]