20520003

素因数分解:

$3^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{229}}^1\times {\mathrm{251}}^1$

素因数の和:507

約数の個数: 32

約数和(自身を含む): 33384960

約数和(自身を除く): 12864957

約数列:

[1, 3, 7, 17, 21, 51, 119, 229, 251, 357, 687, 753, 1603, 1757, 3893, 4267, 4809, 5271, 11679, 12801, 27251, 29869, 57479, 81753, 89607, 172437, 402353, 977143, 1207059, 2931429, 6840001, 20520003]

約数ペア:

[(1, 20520003), (3, 6840001), (7, 2931429), (17, 1207059), (21, 977143), (51, 402353), (119, 172437), (229, 89607), (251, 81753), (357, 57479), (687, 29869), (753, 27251), (1603, 12801), (1757, 11679), (3893, 5271), (4267, 4809)]