81780800

素因数分解:

$2^6\times 5^2\times {\mathrm{79}}^1\times {\mathrm{647}}^1$

素因数の和:748

約数の個数: 84

約数和(自身を含む): 204094080

約数和(自身を除く): 122313280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 79, 80, 100, 158, 160, 200, 316, 320, 395, 400, 632, 647, 790, 800, 1264, 1294, 1580, 1600, 1975, 2528, 2588, 3160, 3235, 3950, 5056, 5176, 6320, 6470, 7900, 10352, 12640, 12940, 15800, 16175, 20704, 25280, 25880, 31600, 32350, 41408, 51113, 51760, 63200, 64700, 102226, 103520, 126400, 129400, 204452, 207040, 255565, 258800, 408904, 511130, 517600, 817808, 1022260, 1035200, 1277825, 1635616, 2044520, 2555650, 3271232, 4089040, 5111300, 8178080, 10222600, 16356160, 20445200, 40890400, 81780800]

約数ペア:

[(1, 81780800), (2, 40890400), (4, 20445200), (5, 16356160), (8, 10222600), (10, 8178080), (16, 5111300), (20, 4089040), (25, 3271232), (32, 2555650), (40, 2044520), (50, 1635616), (64, 1277825), (79, 1035200), (80, 1022260), (100, 817808), (158, 517600), (160, 511130), (200, 408904), (316, 258800), (320, 255565), (395, 207040), (400, 204452), (632, 129400), (647, 126400), (790, 103520), (800, 102226), (1264, 64700), (1294, 63200), (1580, 51760), (1600, 51113), (1975, 41408), (2528, 32350), (2588, 31600), (3160, 25880), (3235, 25280), (3950, 20704), (5056, 16175), (5176, 15800), (6320, 12940), (6470, 12640), (7900, 10352)]