21004515

素因数分解:

$3^4\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{239}}^1$

素因数の和:294

約数の個数: 80

約数和(自身を含む): 44605440

約数和(自身を除く): 23600925

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 31, 35, 45, 63, 81, 93, 105, 135, 155, 189, 217, 239, 279, 315, 405, 465, 567, 651, 717, 837, 945, 1085, 1195, 1395, 1673, 1953, 2151, 2511, 2835, 3255, 3585, 4185, 5019, 5859, 6453, 7409, 8365, 9765, 10755, 12555, 15057, 17577, 19359, 22227, 25095, 29295, 32265, 37045, 45171, 51863, 66681, 75285, 87885, 96795, 111135, 135513, 155589, 200043, 225855, 259315, 333405, 466767, 600129, 677565, 777945, 1000215, 1400301, 2333835, 3000645, 4200903, 7001505, 21004515]

約数ペア:

[(1, 21004515), (3, 7001505), (5, 4200903), (7, 3000645), (9, 2333835), (15, 1400301), (21, 1000215), (27, 777945), (31, 677565), (35, 600129), (45, 466767), (63, 333405), (81, 259315), (93, 225855), (105, 200043), (135, 155589), (155, 135513), (189, 111135), (217, 96795), (239, 87885), (279, 75285), (315, 66681), (405, 51863), (465, 45171), (567, 37045), (651, 32265), (717, 29295), (837, 25095), (945, 22227), (1085, 19359), (1195, 17577), (1395, 15057), (1673, 12555), (1953, 10755), (2151, 9765), (2511, 8365), (2835, 7409), (3255, 6453), (3585, 5859), (4185, 5019)]