21338655

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{157}}^1$

素因数の和:236

約数の個数: 64

約数和(自身を含む): 40134528

約数和(自身を除く): 18795873

約数列:

[1, 3, 5, 13, 15, 17, 39, 41, 51, 65, 85, 123, 157, 195, 205, 221, 255, 471, 533, 615, 663, 697, 785, 1105, 1599, 2041, 2091, 2355, 2665, 2669, 3315, 3485, 6123, 6437, 7995, 8007, 9061, 10205, 10455, 13345, 19311, 27183, 30615, 32185, 34697, 40035, 45305, 83681, 96555, 104091, 109429, 135915, 173485, 251043, 328287, 418405, 520455, 547145, 1255215, 1422577, 1641435, 4267731, 7112885, 21338655]

約数ペア:

[(1, 21338655), (3, 7112885), (5, 4267731), (13, 1641435), (15, 1422577), (17, 1255215), (39, 547145), (41, 520455), (51, 418405), (65, 328287), (85, 251043), (123, 173485), (157, 135915), (195, 109429), (205, 104091), (221, 96555), (255, 83681), (471, 45305), (533, 40035), (615, 34697), (663, 32185), (697, 30615), (785, 27183), (1105, 19311), (1599, 13345), (2041, 10455), (2091, 10205), (2355, 9061), (2665, 8007), (2669, 7995), (3315, 6437), (3485, 6123)]