20018780

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{139}}^1\times {\mathrm{379}}^1$

素因数の和:546

約数の個数: 48

約数和(自身を含む): 44688000

約数和(自身を除く): 24669220

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 139, 190, 278, 379, 380, 556, 695, 758, 1390, 1516, 1895, 2641, 2780, 3790, 5282, 7201, 7580, 10564, 13205, 14402, 26410, 28804, 36005, 52681, 52820, 72010, 105362, 144020, 210724, 263405, 526810, 1000939, 1053620, 2001878, 4003756, 5004695, 10009390, 20018780]

約数ペア:

[(1, 20018780), (2, 10009390), (4, 5004695), (5, 4003756), (10, 2001878), (19, 1053620), (20, 1000939), (38, 526810), (76, 263405), (95, 210724), (139, 144020), (190, 105362), (278, 72010), (379, 52820), (380, 52681), (556, 36005), (695, 28804), (758, 26410), (1390, 14402), (1516, 13205), (1895, 10564), (2641, 7580), (2780, 7201), (3790, 5282)]