81316280

素因数分解:

$2^3\times 5^1\times {\mathrm{79}}^1\times {\mathrm{25733}}^1$

素因数の和:25823

約数の個数: 32

約数和(自身を含む): 185284800

約数和(自身を除く): 103968520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 79, 158, 316, 395, 632, 790, 1580, 3160, 25733, 51466, 102932, 128665, 205864, 257330, 514660, 1029320, 2032907, 4065814, 8131628, 10164535, 16263256, 20329070, 40658140, 81316280]

約数ペア:

[(1, 81316280), (2, 40658140), (4, 20329070), (5, 16263256), (8, 10164535), (10, 8131628), (20, 4065814), (40, 2032907), (79, 1029320), (158, 514660), (316, 257330), (395, 205864), (632, 128665), (790, 102932), (1580, 51466), (3160, 25733)]