1656320

素因数分解:

$2^9\times 5^1\times {\mathrm{647}}^1$

素因数の和:670

約数の個数: 40

約数和(自身を含む): 3977424

約数和(自身を除く): 2321104

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 647, 1280, 1294, 2560, 2588, 3235, 5176, 6470, 10352, 12940, 20704, 25880, 41408, 51760, 82816, 103520, 165632, 207040, 331264, 414080, 828160, 1656320]

約数ペア:

[(1, 1656320), (2, 828160), (4, 414080), (5, 331264), (8, 207040), (10, 165632), (16, 103520), (20, 82816), (32, 51760), (40, 41408), (64, 25880), (80, 20704), (128, 12940), (160, 10352), (256, 6470), (320, 5176), (512, 3235), (640, 2588), (647, 2560), (1280, 1294)]