21494715

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{79}}^1\times {\mathrm{97}}^1$

素因数の和:212

約数の個数: 64

約数和(自身を含む): 40642560

約数和(自身を除く): 19147845

約数列:

[1, 3, 5, 11, 15, 17, 33, 51, 55, 79, 85, 97, 165, 187, 237, 255, 291, 395, 485, 561, 869, 935, 1067, 1185, 1343, 1455, 1649, 2607, 2805, 3201, 4029, 4345, 4947, 5335, 6715, 7663, 8245, 13035, 14773, 16005, 18139, 20145, 22989, 24735, 38315, 44319, 54417, 73865, 84293, 90695, 114945, 130271, 221595, 252879, 272085, 390813, 421465, 651355, 1264395, 1432981, 1954065, 4298943, 7164905, 21494715]

約数ペア:

[(1, 21494715), (3, 7164905), (5, 4298943), (11, 1954065), (15, 1432981), (17, 1264395), (33, 651355), (51, 421465), (55, 390813), (79, 272085), (85, 252879), (97, 221595), (165, 130271), (187, 114945), (237, 90695), (255, 84293), (291, 73865), (395, 54417), (485, 44319), (561, 38315), (869, 24735), (935, 22989), (1067, 20145), (1185, 18139), (1343, 16005), (1455, 14773), (1649, 13035), (2607, 8245), (2805, 7663), (3201, 6715), (4029, 5335), (4345, 4947)]