21009723

素因数分解:

$3^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{59}}^1\times {\mathrm{547}}^1$

素因数の和:647

約数の個数: 32

約数和(自身を含む): 33669120

約数和(自身を除く): 12659397

約数列:

[1, 3, 7, 21, 31, 59, 93, 177, 217, 413, 547, 651, 1239, 1641, 1829, 3829, 5487, 11487, 12803, 16957, 32273, 38409, 50871, 96819, 118699, 225911, 356097, 677733, 1000463, 3001389, 7003241, 21009723]

約数ペア:

[(1, 21009723), (3, 7003241), (7, 3001389), (21, 1000463), (31, 677733), (59, 356097), (93, 225911), (177, 118699), (217, 96819), (413, 50871), (547, 38409), (651, 32273), (1239, 16957), (1641, 12803), (1829, 11487), (3829, 5487)]