20479280

素因数分解:

$2^4\times 5^1\times {\mathrm{281}}^1\times {\mathrm{911}}^1$

素因数の和:1205

約数の個数: 40

約数和(自身を含む): 47836224

約数和(自身を除く): 27356944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 281, 562, 911, 1124, 1405, 1822, 2248, 2810, 3644, 4496, 4555, 5620, 7288, 9110, 11240, 14576, 18220, 22480, 36440, 72880, 255991, 511982, 1023964, 1279955, 2047928, 2559910, 4095856, 5119820, 10239640, 20479280]

約数ペア:

[(1, 20479280), (2, 10239640), (4, 5119820), (5, 4095856), (8, 2559910), (10, 2047928), (16, 1279955), (20, 1023964), (40, 511982), (80, 255991), (281, 72880), (562, 36440), (911, 22480), (1124, 18220), (1405, 14576), (1822, 11240), (2248, 9110), (2810, 7288), (3644, 5620), (4496, 4555)]