21131020

素因数分解:

$2^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{647}}^1$

素因数の和:750

約数の個数: 48

約数和(自身を含む): 47029248

約数和(自身を除く): 25898228

約数列:

[1, 2, 4, 5, 10, 20, 23, 46, 71, 92, 115, 142, 230, 284, 355, 460, 647, 710, 1294, 1420, 1633, 2588, 3235, 3266, 6470, 6532, 8165, 12940, 14881, 16330, 29762, 32660, 45937, 59524, 74405, 91874, 148810, 183748, 229685, 297620, 459370, 918740, 1056551, 2113102, 4226204, 5282755, 10565510, 21131020]

約数ペア:

[(1, 21131020), (2, 10565510), (4, 5282755), (5, 4226204), (10, 2113102), (20, 1056551), (23, 918740), (46, 459370), (71, 297620), (92, 229685), (115, 183748), (142, 148810), (230, 91874), (284, 74405), (355, 59524), (460, 45937), (647, 32660), (710, 29762), (1294, 16330), (1420, 14881), (1633, 12940), (2588, 8165), (3235, 6532), (3266, 6470)]