19998640

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{223}}^1$

素因数の和:314

約数の個数: 80

約数和(自身を含む): 49996800

約数和(自身を除く): 29998160

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 59, 76, 80, 95, 118, 152, 190, 223, 236, 295, 304, 380, 446, 472, 590, 760, 892, 944, 1115, 1121, 1180, 1520, 1784, 2230, 2242, 2360, 3568, 4237, 4460, 4484, 4720, 5605, 8474, 8920, 8968, 11210, 13157, 16948, 17840, 17936, 21185, 22420, 26314, 33896, 42370, 44840, 52628, 65785, 67792, 84740, 89680, 105256, 131570, 169480, 210512, 249983, 263140, 338960, 499966, 526280, 999932, 1052560, 1249915, 1999864, 2499830, 3999728, 4999660, 9999320, 19998640]

約数ペア:

[(1, 19998640), (2, 9999320), (4, 4999660), (5, 3999728), (8, 2499830), (10, 1999864), (16, 1249915), (19, 1052560), (20, 999932), (38, 526280), (40, 499966), (59, 338960), (76, 263140), (80, 249983), (95, 210512), (118, 169480), (152, 131570), (190, 105256), (223, 89680), (236, 84740), (295, 67792), (304, 65785), (380, 52628), (446, 44840), (472, 42370), (590, 33896), (760, 26314), (892, 22420), (944, 21185), (1115, 17936), (1121, 17840), (1180, 16948), (1520, 13157), (1784, 11210), (2230, 8968), (2242, 8920), (2360, 8474), (3568, 5605), (4237, 4720), (4460, 4484)]