15281721

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{397}}^1$

素因数の和:470

約数の個数: 48

約数和(自身を含む): 27815424

約数和(自身を除く): 12533703

約数列:

[1, 3, 7, 9, 13, 21, 39, 47, 63, 91, 117, 141, 273, 329, 397, 423, 611, 819, 987, 1191, 1833, 2779, 2961, 3573, 4277, 5161, 5499, 8337, 12831, 15483, 18659, 25011, 36127, 38493, 46449, 55977, 108381, 130613, 167931, 242567, 325143, 391839, 727701, 1175517, 1697969, 2183103, 5093907, 15281721]

約数ペア:

[(1, 15281721), (3, 5093907), (7, 2183103), (9, 1697969), (13, 1175517), (21, 727701), (39, 391839), (47, 325143), (63, 242567), (91, 167931), (117, 130613), (141, 108381), (273, 55977), (329, 46449), (397, 38493), (423, 36127), (611, 25011), (819, 18659), (987, 15483), (1191, 12831), (1833, 8337), (2779, 5499), (2961, 5161), (3573, 4277)]