20856880

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{173}}^1$

素因数の和:334

約数の個数: 80

約数和(自身を含む): 53594784

約数和(自身を除く): 32737904

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 110, 137, 173, 176, 220, 274, 346, 440, 548, 685, 692, 865, 880, 1096, 1370, 1384, 1507, 1730, 1903, 2192, 2740, 2768, 3014, 3460, 3806, 5480, 6028, 6920, 7535, 7612, 9515, 10960, 12056, 13840, 15070, 15224, 19030, 23701, 24112, 30140, 30448, 38060, 47402, 60280, 76120, 94804, 118505, 120560, 152240, 189608, 237010, 260711, 379216, 474020, 521422, 948040, 1042844, 1303555, 1896080, 2085688, 2607110, 4171376, 5214220, 10428440, 20856880]

約数ペア:

[(1, 20856880), (2, 10428440), (4, 5214220), (5, 4171376), (8, 2607110), (10, 2085688), (11, 1896080), (16, 1303555), (20, 1042844), (22, 948040), (40, 521422), (44, 474020), (55, 379216), (80, 260711), (88, 237010), (110, 189608), (137, 152240), (173, 120560), (176, 118505), (220, 94804), (274, 76120), (346, 60280), (440, 47402), (548, 38060), (685, 30448), (692, 30140), (865, 24112), (880, 23701), (1096, 19030), (1370, 15224), (1384, 15070), (1507, 13840), (1730, 12056), (1903, 10960), (2192, 9515), (2740, 7612), (2768, 7535), (3014, 6920), (3460, 6028), (3806, 5480)]