21720020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{167}}^1\times {\mathrm{929}}^1$

素因数の和:1112

約数の個数: 48

約数和(自身を含む): 52496640

約数和(自身を除く): 30776620

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 167, 334, 668, 835, 929, 1169, 1670, 1858, 2338, 3340, 3716, 4645, 4676, 5845, 6503, 9290, 11690, 13006, 18580, 23380, 26012, 32515, 65030, 130060, 155143, 310286, 620572, 775715, 1086001, 1551430, 2172002, 3102860, 4344004, 5430005, 10860010, 21720020]

約数ペア:

[(1, 21720020), (2, 10860010), (4, 5430005), (5, 4344004), (7, 3102860), (10, 2172002), (14, 1551430), (20, 1086001), (28, 775715), (35, 620572), (70, 310286), (140, 155143), (167, 130060), (334, 65030), (668, 32515), (835, 26012), (929, 23380), (1169, 18580), (1670, 13006), (1858, 11690), (2338, 9290), (3340, 6503), (3716, 5845), (4645, 4676)]