21381376

素因数分解:

$2^8\times {\mathrm{17}}^4$

素因数の和:84

約数の個数: 45

約数和(自身を含む): 45346651

約数和(自身を除く): 23965275

約数列:

[1, 2, 4, 8, 16, 17, 32, 34, 64, 68, 128, 136, 256, 272, 289, 544, 578, 1088, 1156, 2176, 2312, 4352, 4624, 4913, 9248, 9826, 18496, 19652, 36992, 39304, 73984, 78608, 83521, 157216, 167042, 314432, 334084, 628864, 668168, 1257728, 1336336, 2672672, 5345344, 10690688, 21381376]

約数ペア:

[(1, 21381376), (2, 10690688), (4, 5345344), (8, 2672672), (16, 1336336), (17, 1257728), (32, 668168), (34, 628864), (64, 334084), (68, 314432), (128, 167042), (136, 157216), (256, 83521), (272, 78608), (289, 73984), (544, 39304), (578, 36992), (1088, 19652), (1156, 18496), (2176, 9826), (2312, 9248), (4352, 4913)]