21005817

素因数分解:

$3^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{787}}^1$

素因数の和:869

約数の個数: 32

約数和(自身を含む): 33890304

約数和(自身を除く): 12884487

約数列:

[1, 3, 7, 21, 31, 41, 93, 123, 217, 287, 651, 787, 861, 1271, 2361, 3813, 5509, 8897, 16527, 24397, 26691, 32267, 73191, 96801, 170779, 225869, 512337, 677607, 1000277, 3000831, 7001939, 21005817]

約数ペア:

[(1, 21005817), (3, 7001939), (7, 3000831), (21, 1000277), (31, 677607), (41, 512337), (93, 225869), (123, 170779), (217, 96801), (287, 73191), (651, 32267), (787, 26691), (861, 24397), (1271, 16527), (2361, 8897), (3813, 5509)]