20720420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{47}}^2\times {\mathrm{67}}^1$

素因数の和:177

約数の個数: 72

約数和(自身を含む): 51567936

約数和(自身を除く): 30847516

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 47, 67, 70, 94, 134, 140, 188, 235, 268, 329, 335, 469, 470, 658, 670, 938, 940, 1316, 1340, 1645, 1876, 2209, 2345, 3149, 3290, 4418, 4690, 6298, 6580, 8836, 9380, 11045, 12596, 15463, 15745, 22043, 22090, 30926, 31490, 44086, 44180, 61852, 62980, 77315, 88172, 110215, 148003, 154630, 220430, 296006, 309260, 440860, 592012, 740015, 1036021, 1480030, 2072042, 2960060, 4144084, 5180105, 10360210, 20720420]

約数ペア:

[(1, 20720420), (2, 10360210), (4, 5180105), (5, 4144084), (7, 2960060), (10, 2072042), (14, 1480030), (20, 1036021), (28, 740015), (35, 592012), (47, 440860), (67, 309260), (70, 296006), (94, 220430), (134, 154630), (140, 148003), (188, 110215), (235, 88172), (268, 77315), (329, 62980), (335, 61852), (469, 44180), (470, 44086), (658, 31490), (670, 30926), (938, 22090), (940, 22043), (1316, 15745), (1340, 15463), (1645, 12596), (1876, 11045), (2209, 9380), (2345, 8836), (3149, 6580), (3290, 6298), (4418, 4690)]