21180005

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{271}}^1$

素因数の和:330

約数の個数: 48

約数和(自身を含む): 33488640

約数和(自身を除く): 12308635

約数列:

[1, 5, 7, 11, 29, 35, 49, 55, 77, 145, 203, 245, 271, 319, 385, 539, 1015, 1355, 1421, 1595, 1897, 2233, 2695, 2981, 7105, 7859, 9485, 11165, 13279, 14905, 15631, 20867, 39295, 55013, 66395, 78155, 86449, 104335, 146069, 275065, 385091, 432245, 605143, 730345, 1925455, 3025715, 4236001, 21180005]

約数ペア:

[(1, 21180005), (5, 4236001), (7, 3025715), (11, 1925455), (29, 730345), (35, 605143), (49, 432245), (55, 385091), (77, 275065), (145, 146069), (203, 104335), (245, 86449), (271, 78155), (319, 66395), (385, 55013), (539, 39295), (1015, 20867), (1355, 15631), (1421, 14905), (1595, 13279), (1897, 11165), (2233, 9485), (2695, 7859), (2981, 7105)]