21138208

素因数分解:

$2^5\times 7^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1$

素因数の和:115

約数の個数: 144

約数和(自身を含む): 56105784

約数和(自身を除く): 34967576

約数列:

[1, 2, 4, 7, 8, 13, 14, 16, 17, 26, 28, 32, 34, 49, 52, 56, 61, 68, 91, 98, 104, 112, 119, 122, 136, 182, 196, 208, 221, 224, 238, 244, 272, 364, 392, 416, 427, 442, 476, 488, 544, 637, 728, 784, 793, 833, 854, 884, 952, 976, 1037, 1274, 1456, 1547, 1568, 1586, 1666, 1708, 1768, 1904, 1952, 2074, 2548, 2912, 2989, 3094, 3172, 3332, 3416, 3536, 3808, 4148, 5096, 5551, 5978, 6188, 6344, 6664, 6832, 7072, 7259, 8296, 10192, 10829, 11102, 11956, 12376, 12688, 13328, 13481, 13664, 14518, 16592, 20384, 21658, 22204, 23912, 24752, 25376, 26656, 26962, 29036, 33184, 38857, 43316, 44408, 47824, 49504, 50813, 53924, 58072, 77714, 86632, 88816, 94367, 95648, 101626, 107848, 116144, 155428, 173264, 177632, 188734, 203252, 215696, 232288, 310856, 346528, 377468, 406504, 431392, 621712, 660569, 754936, 813008, 1243424, 1321138, 1509872, 1626016, 2642276, 3019744, 5284552, 10569104, 21138208]

約数ペア:

[(1, 21138208), (2, 10569104), (4, 5284552), (7, 3019744), (8, 2642276), (13, 1626016), (14, 1509872), (16, 1321138), (17, 1243424), (26, 813008), (28, 754936), (32, 660569), (34, 621712), (49, 431392), (52, 406504), (56, 377468), (61, 346528), (68, 310856), (91, 232288), (98, 215696), (104, 203252), (112, 188734), (119, 177632), (122, 173264), (136, 155428), (182, 116144), (196, 107848), (208, 101626), (221, 95648), (224, 94367), (238, 88816), (244, 86632), (272, 77714), (364, 58072), (392, 53924), (416, 50813), (427, 49504), (442, 47824), (476, 44408), (488, 43316), (544, 38857), (637, 33184), (728, 29036), (784, 26962), (793, 26656), (833, 25376), (854, 24752), (884, 23912), (952, 22204), (976, 21658), (1037, 20384), (1274, 16592), (1456, 14518), (1547, 13664), (1568, 13481), (1586, 13328), (1666, 12688), (1708, 12376), (1768, 11956), (1904, 11102), (1952, 10829), (2074, 10192), (2548, 8296), (2912, 7259), (2989, 7072), (3094, 6832), (3172, 6664), (3332, 6344), (3416, 6188), (3536, 5978), (3808, 5551), (4148, 5096)]