642580

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^2\times {\mathrm{89}}^1$

素因数の和:136

約数の個数: 36

約数和(自身を含む): 1440180

約数和(自身を除く): 797600

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 89, 95, 178, 190, 356, 361, 380, 445, 722, 890, 1444, 1691, 1780, 1805, 3382, 3610, 6764, 7220, 8455, 16910, 32129, 33820, 64258, 128516, 160645, 321290, 642580]

約数ペア:

[(1, 642580), (2, 321290), (4, 160645), (5, 128516), (10, 64258), (19, 33820), (20, 32129), (38, 16910), (76, 8455), (89, 7220), (95, 6764), (178, 3610), (190, 3382), (356, 1805), (361, 1780), (380, 1691), (445, 1444), (722, 890)]