21204015

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{1697}}^1$

素因数の和:1736

約数の個数: 48

約数和(自身を含む): 41811552

約数和(自身を除く): 20607537

約数列:

[1, 3, 5, 7, 15, 17, 21, 35, 49, 51, 85, 105, 119, 147, 245, 255, 357, 595, 735, 833, 1697, 1785, 2499, 4165, 5091, 8485, 11879, 12495, 25455, 28849, 35637, 59395, 83153, 86547, 144245, 178185, 201943, 249459, 415765, 432735, 605829, 1009715, 1247295, 1413601, 3029145, 4240803, 7068005, 21204015]

約数ペア:

[(1, 21204015), (3, 7068005), (5, 4240803), (7, 3029145), (15, 1413601), (17, 1247295), (21, 1009715), (35, 605829), (49, 432735), (51, 415765), (85, 249459), (105, 201943), (119, 178185), (147, 144245), (245, 86547), (255, 83153), (357, 59395), (595, 35637), (735, 28849), (833, 25455), (1697, 12495), (1785, 11879), (2499, 8485), (4165, 5091)]