21155920

素因数分解:

$2^4\times 5^1\times {\mathrm{67}}^1\times {\mathrm{3947}}^1$

素因数の和:4027

約数の個数: 40

約数和(自身を含む): 49934304

約数和(自身を除く): 28778384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 67, 80, 134, 268, 335, 536, 670, 1072, 1340, 2680, 3947, 5360, 7894, 15788, 19735, 31576, 39470, 63152, 78940, 157880, 264449, 315760, 528898, 1057796, 1322245, 2115592, 2644490, 4231184, 5288980, 10577960, 21155920]

約数ペア:

[(1, 21155920), (2, 10577960), (4, 5288980), (5, 4231184), (8, 2644490), (10, 2115592), (16, 1322245), (20, 1057796), (40, 528898), (67, 315760), (80, 264449), (134, 157880), (268, 78940), (335, 63152), (536, 39470), (670, 31576), (1072, 19735), (1340, 15788), (2680, 7894), (3947, 5360)]