81210640

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{20717}}^1$

素因数の和:20744

約数の個数: 60

約数和(自身を含む): 219652236

約数和(自身を除く): 138441596

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 20717, 41434, 82868, 103585, 145019, 165736, 207170, 290038, 331472, 414340, 580076, 725095, 828680, 1015133, 1160152, 1450190, 1657360, 2030266, 2320304, 2900380, 4060532, 5075665, 5800760, 8121064, 10151330, 11601520, 16242128, 20302660, 40605320, 81210640]

約数ペア:

[(1, 81210640), (2, 40605320), (4, 20302660), (5, 16242128), (7, 11601520), (8, 10151330), (10, 8121064), (14, 5800760), (16, 5075665), (20, 4060532), (28, 2900380), (35, 2320304), (40, 2030266), (49, 1657360), (56, 1450190), (70, 1160152), (80, 1015133), (98, 828680), (112, 725095), (140, 580076), (196, 414340), (245, 331472), (280, 290038), (392, 207170), (490, 165736), (560, 145019), (784, 103585), (980, 82868), (1960, 41434), (3920, 20717)]