19985920

素因数分解:

$2^9\times 5^1\times {\mathrm{37}}^1\times {\mathrm{211}}^1$

素因数の和:271

約数の個数: 80

約数和(自身を含む): 49447728

約数和(自身を除く): 29461808

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 37, 40, 64, 74, 80, 128, 148, 160, 185, 211, 256, 296, 320, 370, 422, 512, 592, 640, 740, 844, 1055, 1184, 1280, 1480, 1688, 2110, 2368, 2560, 2960, 3376, 4220, 4736, 5920, 6752, 7807, 8440, 9472, 11840, 13504, 15614, 16880, 18944, 23680, 27008, 31228, 33760, 39035, 47360, 54016, 62456, 67520, 78070, 94720, 108032, 124912, 135040, 156140, 249824, 270080, 312280, 499648, 540160, 624560, 999296, 1249120, 1998592, 2498240, 3997184, 4996480, 9992960, 19985920]

約数ペア:

[(1, 19985920), (2, 9992960), (4, 4996480), (5, 3997184), (8, 2498240), (10, 1998592), (16, 1249120), (20, 999296), (32, 624560), (37, 540160), (40, 499648), (64, 312280), (74, 270080), (80, 249824), (128, 156140), (148, 135040), (160, 124912), (185, 108032), (211, 94720), (256, 78070), (296, 67520), (320, 62456), (370, 54016), (422, 47360), (512, 39035), (592, 33760), (640, 31228), (740, 27008), (844, 23680), (1055, 18944), (1184, 16880), (1280, 15614), (1480, 13504), (1688, 11840), (2110, 9472), (2368, 8440), (2560, 7807), (2960, 6752), (3376, 5920), (4220, 4736)]