19983451648

素因数分解:

$2^9\times {\mathrm{61}}^1\times {\mathrm{639839}}^1$

素因数の和:639918

約数の個数: 40

約数和(自身を含む): 40582491840

約数和(自身を除く): 20599040192

約数列:

[1, 2, 4, 8, 16, 32, 61, 64, 122, 128, 244, 256, 488, 512, 976, 1952, 3904, 7808, 15616, 31232, 639839, 1279678, 2559356, 5118712, 10237424, 20474848, 39030179, 40949696, 78060358, 81899392, 156120716, 163798784, 312241432, 327597568, 624482864, 1248965728, 2497931456, 4995862912, 9991725824, 19983451648]

約数ペア:

[(1, 19983451648), (2, 9991725824), (4, 4995862912), (8, 2497931456), (16, 1248965728), (32, 624482864), (61, 327597568), (64, 312241432), (122, 163798784), (128, 156120716), (244, 81899392), (256, 78060358), (488, 40949696), (512, 39030179), (976, 20474848), (1952, 10237424), (3904, 5118712), (7808, 2559356), (15616, 1279678), (31232, 639839)]