644807792

素因数分解:

$2^4\times {\mathrm{157}}^1\times {\mathrm{197}}^1\times {\mathrm{1303}}^1$

素因数の和:1665

約数の個数: 40

約数和(自身を含む): 1264624416

約数和(自身を除く): 619816624

約数列:

[1, 2, 4, 8, 16, 157, 197, 314, 394, 628, 788, 1256, 1303, 1576, 2512, 2606, 3152, 5212, 10424, 20848, 30929, 61858, 123716, 204571, 247432, 256691, 409142, 494864, 513382, 818284, 1026764, 1636568, 2053528, 3273136, 4107056, 40300487, 80600974, 161201948, 322403896, 644807792]

約数ペア:

[(1, 644807792), (2, 322403896), (4, 161201948), (8, 80600974), (16, 40300487), (157, 4107056), (197, 3273136), (314, 2053528), (394, 1636568), (628, 1026764), (788, 818284), (1256, 513382), (1303, 494864), (1576, 409142), (2512, 256691), (2606, 247432), (3152, 204571), (5212, 123716), (10424, 61858), (20848, 30929)]