81156980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^2\times {\mathrm{19}}^1\times {\mathrm{739}}^1$

素因数の和:801

約数の個数: 72

約数和(自身を含む): 190831200

約数和(自身を除く): 109674220

約数列:

[1, 2, 4, 5, 10, 17, 19, 20, 34, 38, 68, 76, 85, 95, 170, 190, 289, 323, 340, 380, 578, 646, 739, 1156, 1292, 1445, 1478, 1615, 2890, 2956, 3230, 3695, 5491, 5780, 6460, 7390, 10982, 12563, 14041, 14780, 21964, 25126, 27455, 28082, 50252, 54910, 56164, 62815, 70205, 109820, 125630, 140410, 213571, 238697, 251260, 280820, 427142, 477394, 854284, 954788, 1067855, 1193485, 2135710, 2386970, 4057849, 4271420, 4773940, 8115698, 16231396, 20289245, 40578490, 81156980]

約数ペア:

[(1, 81156980), (2, 40578490), (4, 20289245), (5, 16231396), (10, 8115698), (17, 4773940), (19, 4271420), (20, 4057849), (34, 2386970), (38, 2135710), (68, 1193485), (76, 1067855), (85, 954788), (95, 854284), (170, 477394), (190, 427142), (289, 280820), (323, 251260), (340, 238697), (380, 213571), (578, 140410), (646, 125630), (739, 109820), (1156, 70205), (1292, 62815), (1445, 56164), (1478, 54910), (1615, 50252), (2890, 28082), (2956, 27455), (3230, 25126), (3695, 21964), (5491, 14780), (5780, 14041), (6460, 12563), (7390, 10982)]