21471320

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{263}}^1$

素因数の和:444

約数の個数: 64

約数和(自身を含む): 52557120

約数和(自身を除く): 31085800

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 157, 260, 263, 314, 520, 526, 628, 785, 1052, 1256, 1315, 1570, 2041, 2104, 2630, 3140, 3419, 4082, 5260, 6280, 6838, 8164, 10205, 10520, 13676, 16328, 17095, 20410, 27352, 34190, 40820, 41291, 68380, 81640, 82582, 136760, 165164, 206455, 330328, 412910, 536783, 825820, 1073566, 1651640, 2147132, 2683915, 4294264, 5367830, 10735660, 21471320]

約数ペア:

[(1, 21471320), (2, 10735660), (4, 5367830), (5, 4294264), (8, 2683915), (10, 2147132), (13, 1651640), (20, 1073566), (26, 825820), (40, 536783), (52, 412910), (65, 330328), (104, 206455), (130, 165164), (157, 136760), (260, 82582), (263, 81640), (314, 68380), (520, 41291), (526, 40820), (628, 34190), (785, 27352), (1052, 20410), (1256, 17095), (1315, 16328), (1570, 13676), (2041, 10520), (2104, 10205), (2630, 8164), (3140, 6838), (3419, 6280), (4082, 5260)]