81406720

素因数分解:

$2^8\times 5^1\times {\mathrm{63599}}^1$

素因数の和:63620

約数の個数: 36

約数和(自身を含む): 194997600

約数和(自身を除く): 113590880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280, 63599, 127198, 254396, 317995, 508792, 635990, 1017584, 1271980, 2035168, 2543960, 4070336, 5087920, 8140672, 10175840, 16281344, 20351680, 40703360, 81406720]

約数ペア:

[(1, 81406720), (2, 40703360), (4, 20351680), (5, 16281344), (8, 10175840), (10, 8140672), (16, 5087920), (20, 4070336), (32, 2543960), (40, 2035168), (64, 1271980), (80, 1017584), (128, 635990), (160, 508792), (256, 317995), (320, 254396), (640, 127198), (1280, 63599)]