19994740

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{89}}^1\times {\mathrm{239}}^1$

素因数の和:384

約数の個数: 48

約数和(自身を含む): 43545600

約数和(自身を除く): 23550860

約数列:

[1, 2, 4, 5, 10, 20, 47, 89, 94, 178, 188, 235, 239, 356, 445, 470, 478, 890, 940, 956, 1195, 1780, 2390, 4183, 4780, 8366, 11233, 16732, 20915, 21271, 22466, 41830, 42542, 44932, 56165, 83660, 85084, 106355, 112330, 212710, 224660, 425420, 999737, 1999474, 3998948, 4998685, 9997370, 19994740]

約数ペア:

[(1, 19994740), (2, 9997370), (4, 4998685), (5, 3998948), (10, 1999474), (20, 999737), (47, 425420), (89, 224660), (94, 212710), (178, 112330), (188, 106355), (235, 85084), (239, 83660), (356, 56165), (445, 44932), (470, 42542), (478, 41830), (890, 22466), (940, 21271), (956, 20915), (1195, 16732), (1780, 11233), (2390, 8366), (4183, 4780)]