20389880

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{101}}^1\times {\mathrm{103}}^1$

素因数の和:229

約数の個数: 96

約数和(自身を含む): 54419040

約数和(自身を除く): 34029160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 101, 103, 140, 196, 202, 206, 245, 280, 392, 404, 412, 490, 505, 515, 707, 721, 808, 824, 980, 1010, 1030, 1414, 1442, 1960, 2020, 2060, 2828, 2884, 3535, 3605, 4040, 4120, 4949, 5047, 5656, 5768, 7070, 7210, 9898, 10094, 10403, 14140, 14420, 19796, 20188, 20806, 24745, 25235, 28280, 28840, 39592, 40376, 41612, 49490, 50470, 52015, 72821, 83224, 98980, 100940, 104030, 145642, 197960, 201880, 208060, 291284, 364105, 416120, 509747, 582568, 728210, 1019494, 1456420, 2038988, 2548735, 2912840, 4077976, 5097470, 10194940, 20389880]

約数ペア:

[(1, 20389880), (2, 10194940), (4, 5097470), (5, 4077976), (7, 2912840), (8, 2548735), (10, 2038988), (14, 1456420), (20, 1019494), (28, 728210), (35, 582568), (40, 509747), (49, 416120), (56, 364105), (70, 291284), (98, 208060), (101, 201880), (103, 197960), (140, 145642), (196, 104030), (202, 100940), (206, 98980), (245, 83224), (280, 72821), (392, 52015), (404, 50470), (412, 49490), (490, 41612), (505, 40376), (515, 39592), (707, 28840), (721, 28280), (808, 25235), (824, 24745), (980, 20806), (1010, 20188), (1030, 19796), (1414, 14420), (1442, 14140), (1960, 10403), (2020, 10094), (2060, 9898), (2828, 7210), (2884, 7070), (3535, 5768), (3605, 5656), (4040, 5047), (4120, 4949)]