21156516

素因数分解:

$2^2\times 3^2\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{173}}^1$

素因数の和:305

約数の個数: 72

約数和(自身を含む): 55735680

約数和(自身を除く): 34579164

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 36, 43, 79, 86, 129, 158, 172, 173, 237, 258, 316, 346, 387, 474, 516, 519, 692, 711, 774, 948, 1038, 1422, 1548, 1557, 2076, 2844, 3114, 3397, 6228, 6794, 7439, 10191, 13588, 13667, 14878, 20382, 22317, 27334, 29756, 30573, 40764, 41001, 44634, 54668, 61146, 66951, 82002, 89268, 122292, 123003, 133902, 164004, 246006, 267804, 492012, 587681, 1175362, 1763043, 2350724, 3526086, 5289129, 7052172, 10578258, 21156516]

約数ペア:

[(1, 21156516), (2, 10578258), (3, 7052172), (4, 5289129), (6, 3526086), (9, 2350724), (12, 1763043), (18, 1175362), (36, 587681), (43, 492012), (79, 267804), (86, 246006), (129, 164004), (158, 133902), (172, 123003), (173, 122292), (237, 89268), (258, 82002), (316, 66951), (346, 61146), (387, 54668), (474, 44634), (516, 41001), (519, 40764), (692, 30573), (711, 29756), (774, 27334), (948, 22317), (1038, 20382), (1422, 14878), (1548, 13667), (1557, 13588), (2076, 10191), (2844, 7439), (3114, 6794), (3397, 6228)]