21243555

素因数分解:

$3^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1$

素因数の和:252

約数の個数: 48

約数和(自身を含む): 38301120

約数和(自身を除く): 17057565

約数列:

[1, 3, 5, 9, 15, 45, 61, 71, 109, 183, 213, 305, 327, 355, 545, 549, 639, 915, 981, 1065, 1635, 2745, 3195, 4331, 4905, 6649, 7739, 12993, 19947, 21655, 23217, 33245, 38695, 38979, 59841, 64965, 69651, 99735, 116085, 194895, 299205, 348255, 472079, 1416237, 2360395, 4248711, 7081185, 21243555]

約数ペア:

[(1, 21243555), (3, 7081185), (5, 4248711), (9, 2360395), (15, 1416237), (45, 472079), (61, 348255), (71, 299205), (109, 194895), (183, 116085), (213, 99735), (305, 69651), (327, 64965), (355, 59841), (545, 38979), (549, 38695), (639, 33245), (915, 23217), (981, 21655), (1065, 19947), (1635, 12993), (2745, 7739), (3195, 6649), (4331, 4905)]