20912955

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{37}}^1\times {\mathrm{769}}^1$

素因数の和:828

約数の個数: 48

約数和(自身を含む): 40027680

約数和(自身を除く): 19114725

約数列:

[1, 3, 5, 7, 15, 21, 35, 37, 49, 105, 111, 147, 185, 245, 259, 555, 735, 769, 777, 1295, 1813, 2307, 3845, 3885, 5383, 5439, 9065, 11535, 16149, 26915, 27195, 28453, 37681, 80745, 85359, 113043, 142265, 188405, 199171, 426795, 565215, 597513, 995855, 1394197, 2987565, 4182591, 6970985, 20912955]

約数ペア:

[(1, 20912955), (3, 6970985), (5, 4182591), (7, 2987565), (15, 1394197), (21, 995855), (35, 597513), (37, 565215), (49, 426795), (105, 199171), (111, 188405), (147, 142265), (185, 113043), (245, 85359), (259, 80745), (555, 37681), (735, 28453), (769, 27195), (777, 26915), (1295, 16149), (1813, 11535), (2307, 9065), (3845, 5439), (3885, 5383)]