20801872

素因数分解:

$2^4\times 7^2\times {\mathrm{13}}^2\times {\mathrm{157}}^1$

素因数の和:205

約数の個数: 90

約数和(自身を含む): 51091038

約数和(自身を除く): 30289166

約数列:

[1, 2, 4, 7, 8, 13, 14, 16, 26, 28, 49, 52, 56, 91, 98, 104, 112, 157, 169, 182, 196, 208, 314, 338, 364, 392, 628, 637, 676, 728, 784, 1099, 1183, 1256, 1274, 1352, 1456, 2041, 2198, 2366, 2512, 2548, 2704, 4082, 4396, 4732, 5096, 7693, 8164, 8281, 8792, 9464, 10192, 14287, 15386, 16328, 16562, 17584, 18928, 26533, 28574, 30772, 32656, 33124, 53066, 57148, 61544, 66248, 100009, 106132, 114296, 123088, 132496, 185731, 200018, 212264, 228592, 371462, 400036, 424528, 742924, 800072, 1300117, 1485848, 1600144, 2600234, 2971696, 5200468, 10400936, 20801872]

約数ペア:

[(1, 20801872), (2, 10400936), (4, 5200468), (7, 2971696), (8, 2600234), (13, 1600144), (14, 1485848), (16, 1300117), (26, 800072), (28, 742924), (49, 424528), (52, 400036), (56, 371462), (91, 228592), (98, 212264), (104, 200018), (112, 185731), (157, 132496), (169, 123088), (182, 114296), (196, 106132), (208, 100009), (314, 66248), (338, 61544), (364, 57148), (392, 53066), (628, 33124), (637, 32656), (676, 30772), (728, 28574), (784, 26533), (1099, 18928), (1183, 17584), (1256, 16562), (1274, 16328), (1352, 15386), (1456, 14287), (2041, 10192), (2198, 9464), (2366, 8792), (2512, 8281), (2548, 8164), (2704, 7693), (4082, 5096), (4396, 4732)]