21720195

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{1301}}^1$

素因数の和:1372

約数の個数: 48

約数和(自身を含む): 43872192

約数和(自身を除く): 22151997

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 53, 63, 105, 159, 265, 315, 371, 477, 795, 1113, 1301, 1855, 2385, 3339, 3903, 5565, 6505, 9107, 11709, 16695, 19515, 27321, 45535, 58545, 68953, 81963, 136605, 206859, 344765, 409815, 482671, 620577, 1034295, 1448013, 2413355, 3102885, 4344039, 7240065, 21720195]

約数ペア:

[(1, 21720195), (3, 7240065), (5, 4344039), (7, 3102885), (9, 2413355), (15, 1448013), (21, 1034295), (35, 620577), (45, 482671), (53, 409815), (63, 344765), (105, 206859), (159, 136605), (265, 81963), (315, 68953), (371, 58545), (477, 45535), (795, 27321), (1113, 19515), (1301, 16695), (1855, 11709), (2385, 9107), (3339, 6505), (3903, 5565)]