28145920

素因数分解:

$2^8\times 5^1\times {\mathrm{11}}^1\times {\mathrm{1999}}^1$

素因数の和:2031

約数の個数: 72

約数和(自身を含む): 73584000

約数和(自身を除く): 45438080

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 44, 55, 64, 80, 88, 110, 128, 160, 176, 220, 256, 320, 352, 440, 640, 704, 880, 1280, 1408, 1760, 1999, 2816, 3520, 3998, 7040, 7996, 9995, 14080, 15992, 19990, 21989, 31984, 39980, 43978, 63968, 79960, 87956, 109945, 127936, 159920, 175912, 219890, 255872, 319840, 351824, 439780, 511744, 639680, 703648, 879560, 1279360, 1407296, 1759120, 2558720, 2814592, 3518240, 5629184, 7036480, 14072960, 28145920]

約数ペア:

[(1, 28145920), (2, 14072960), (4, 7036480), (5, 5629184), (8, 3518240), (10, 2814592), (11, 2558720), (16, 1759120), (20, 1407296), (22, 1279360), (32, 879560), (40, 703648), (44, 639680), (55, 511744), (64, 439780), (80, 351824), (88, 319840), (110, 255872), (128, 219890), (160, 175912), (176, 159920), (220, 127936), (256, 109945), (320, 87956), (352, 79960), (440, 63968), (640, 43978), (704, 39980), (880, 31984), (1280, 21989), (1408, 19990), (1760, 15992), (1999, 14080), (2816, 9995), (3520, 7996), (3998, 7040)]