21990555

素因数分解:

$3^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{137}}^1$

素因数の和:221

約数の個数: 64

約数和(自身を含む): 41731200

約数和(自身を除く): 19740645

約数列:

[1, 3, 5, 9, 15, 27, 29, 41, 45, 87, 123, 135, 137, 145, 205, 261, 369, 411, 435, 615, 685, 783, 1107, 1189, 1233, 1305, 1845, 2055, 3567, 3699, 3915, 3973, 5535, 5617, 5945, 6165, 10701, 11919, 16851, 17835, 18495, 19865, 28085, 32103, 35757, 50553, 53505, 59595, 84255, 107271, 151659, 160515, 162893, 178785, 252765, 488679, 536355, 758295, 814465, 1466037, 2443395, 4398111, 7330185, 21990555]

約数ペア:

[(1, 21990555), (3, 7330185), (5, 4398111), (9, 2443395), (15, 1466037), (27, 814465), (29, 758295), (41, 536355), (45, 488679), (87, 252765), (123, 178785), (135, 162893), (137, 160515), (145, 151659), (205, 107271), (261, 84255), (369, 59595), (411, 53505), (435, 50553), (615, 35757), (685, 32103), (783, 28085), (1107, 19865), (1189, 18495), (1233, 17835), (1305, 16851), (1845, 11919), (2055, 10701), (3567, 6165), (3699, 5945), (3915, 5617), (3973, 5535)]