20281150

素因数分解:

$2^1\times 5^2\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{197}}^1$

素因数の和:309

約数の個数: 48

約数和(自身を含む): 39774240

約数和(自身を除く): 19493090

約数列:

[1, 2, 5, 10, 25, 29, 50, 58, 71, 142, 145, 197, 290, 355, 394, 710, 725, 985, 1450, 1775, 1970, 2059, 3550, 4118, 4925, 5713, 9850, 10295, 11426, 13987, 20590, 27974, 28565, 51475, 57130, 69935, 102950, 139870, 142825, 285650, 349675, 405623, 699350, 811246, 2028115, 4056230, 10140575, 20281150]

約数ペア:

[(1, 20281150), (2, 10140575), (5, 4056230), (10, 2028115), (25, 811246), (29, 699350), (50, 405623), (58, 349675), (71, 285650), (142, 142825), (145, 139870), (197, 102950), (290, 69935), (355, 57130), (394, 51475), (710, 28565), (725, 27974), (985, 20590), (1450, 13987), (1775, 11426), (1970, 10295), (2059, 9850), (3550, 5713), (4118, 4925)]