81431440

素因数分解:

$2^4\times 5^1\times {\mathrm{89}}^1\times {\mathrm{11437}}^1$

素因数の和:11539

約数の個数: 40

約数和(自身を含む): 191472120

約数和(自身を除く): 110040680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 89, 178, 356, 445, 712, 890, 1424, 1780, 3560, 7120, 11437, 22874, 45748, 57185, 91496, 114370, 182992, 228740, 457480, 914960, 1017893, 2035786, 4071572, 5089465, 8143144, 10178930, 16286288, 20357860, 40715720, 81431440]

約数ペア:

[(1, 81431440), (2, 40715720), (4, 20357860), (5, 16286288), (8, 10178930), (10, 8143144), (16, 5089465), (20, 4071572), (40, 2035786), (80, 1017893), (89, 914960), (178, 457480), (356, 228740), (445, 182992), (712, 114370), (890, 91496), (1424, 57185), (1780, 45748), (3560, 22874), (7120, 11437)]