81408280

素因数分解:

$2^3\times 5^1\times {\mathrm{197}}^1\times {\mathrm{10331}}^1$

素因数の和:10539

約数の個数: 32

約数和(自身を含む): 184116240

約数和(自身を除く): 102707960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 197, 394, 788, 985, 1576, 1970, 3940, 7880, 10331, 20662, 41324, 51655, 82648, 103310, 206620, 413240, 2035207, 4070414, 8140828, 10176035, 16281656, 20352070, 40704140, 81408280]

約数ペア:

[(1, 81408280), (2, 40704140), (4, 20352070), (5, 16281656), (8, 10176035), (10, 8140828), (20, 4070414), (40, 2035207), (197, 413240), (394, 206620), (788, 103310), (985, 82648), (1576, 51655), (1970, 41324), (3940, 20662), (7880, 10331)]