20879145

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{557}}^1$

素因数の和:599

約数の個数: 72

約数和(自身を含む): 44655624

約数和(自身を除く): 23776479

約数列:

[1, 3, 5, 7, 9, 15, 17, 21, 35, 45, 49, 51, 63, 85, 105, 119, 147, 153, 245, 255, 315, 357, 441, 557, 595, 735, 765, 833, 1071, 1671, 1785, 2205, 2499, 2785, 3899, 4165, 5013, 5355, 7497, 8355, 9469, 11697, 12495, 19495, 25065, 27293, 28407, 35091, 37485, 47345, 58485, 66283, 81879, 85221, 136465, 142035, 175455, 198849, 245637, 331415, 409395, 426105, 463981, 596547, 994245, 1228185, 1391943, 2319905, 2982735, 4175829, 6959715, 20879145]

約数ペア:

[(1, 20879145), (3, 6959715), (5, 4175829), (7, 2982735), (9, 2319905), (15, 1391943), (17, 1228185), (21, 994245), (35, 596547), (45, 463981), (49, 426105), (51, 409395), (63, 331415), (85, 245637), (105, 198849), (119, 175455), (147, 142035), (153, 136465), (245, 85221), (255, 81879), (315, 66283), (357, 58485), (441, 47345), (557, 37485), (595, 35091), (735, 28407), (765, 27293), (833, 25065), (1071, 19495), (1671, 12495), (1785, 11697), (2205, 9469), (2499, 8355), (2785, 7497), (3899, 5355), (4165, 5013)]