20720655

素因数分解:

$3^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{97}}^1\times {\mathrm{101}}^1$

素因数の和:256

約数の個数: 48

約数和(自身を含む): 37425024

約数和(自身を除く): 16704369

約数列:

[1, 3, 5, 9, 15, 45, 47, 97, 101, 141, 235, 291, 303, 423, 485, 505, 705, 873, 909, 1455, 1515, 2115, 4365, 4545, 4559, 4747, 9797, 13677, 14241, 22795, 23735, 29391, 41031, 42723, 48985, 68385, 71205, 88173, 146955, 205155, 213615, 440865, 460459, 1381377, 2302295, 4144131, 6906885, 20720655]

約数ペア:

[(1, 20720655), (3, 6906885), (5, 4144131), (9, 2302295), (15, 1381377), (45, 460459), (47, 440865), (97, 213615), (101, 205155), (141, 146955), (235, 88173), (291, 71205), (303, 68385), (423, 48985), (485, 42723), (505, 41031), (705, 29391), (873, 23735), (909, 22795), (1455, 14241), (1515, 13677), (2115, 9797), (4365, 4747), (4545, 4559)]