21187984

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{1277}}^1$

素因数の和:1363

約数の個数: 40

約数和(自身を含む): 44213688

約数和(自身を除く): 23025704

約数列:

[1, 2, 4, 8, 16, 17, 34, 61, 68, 122, 136, 244, 272, 488, 976, 1037, 1277, 2074, 2554, 4148, 5108, 8296, 10216, 16592, 20432, 21709, 43418, 77897, 86836, 155794, 173672, 311588, 347344, 623176, 1246352, 1324249, 2648498, 5296996, 10593992, 21187984]

約数ペア:

[(1, 21187984), (2, 10593992), (4, 5296996), (8, 2648498), (16, 1324249), (17, 1246352), (34, 623176), (61, 347344), (68, 311588), (122, 173672), (136, 155794), (244, 86836), (272, 77897), (488, 43418), (976, 21709), (1037, 20432), (1277, 16592), (2074, 10216), (2554, 8296), (4148, 5108)]