20399920

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{13421}}^1$

素因数の和:13453

約数の個数: 40

約数和(自身を含む): 49929840

約数和(自身を除く): 29529920

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 152, 190, 304, 380, 760, 1520, 13421, 26842, 53684, 67105, 107368, 134210, 214736, 254999, 268420, 509998, 536840, 1019996, 1073680, 1274995, 2039992, 2549990, 4079984, 5099980, 10199960, 20399920]

約数ペア:

[(1, 20399920), (2, 10199960), (4, 5099980), (5, 4079984), (8, 2549990), (10, 2039992), (16, 1274995), (19, 1073680), (20, 1019996), (38, 536840), (40, 509998), (76, 268420), (80, 254999), (95, 214736), (152, 134210), (190, 107368), (304, 67105), (380, 53684), (760, 26842), (1520, 13421)]