21828080

素因数分解:

$2^4\times 5^1\times {\mathrm{281}}^1\times {\mathrm{971}}^1$

素因数の和:1265

約数の個数: 40

約数和(自身を含む): 50983344

約数和(自身を除く): 29155264

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 281, 562, 971, 1124, 1405, 1942, 2248, 2810, 3884, 4496, 4855, 5620, 7768, 9710, 11240, 15536, 19420, 22480, 38840, 77680, 272851, 545702, 1091404, 1364255, 2182808, 2728510, 4365616, 5457020, 10914040, 21828080]

約数ペア:

[(1, 21828080), (2, 10914040), (4, 5457020), (5, 4365616), (8, 2728510), (10, 2182808), (16, 1364255), (20, 1091404), (40, 545702), (80, 272851), (281, 77680), (562, 38840), (971, 22480), (1124, 19420), (1405, 15536), (1942, 11240), (2248, 9710), (2810, 7768), (3884, 5620), (4496, 4855)]