21445245

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^3\times {\mathrm{97}}^1$

素因数の和:159

約数の個数: 48

約数和(自身を含む): 39901680

約数和(自身を除く): 18456435

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 97, 153, 255, 289, 291, 485, 765, 867, 873, 1445, 1455, 1649, 2601, 4335, 4365, 4913, 4947, 8245, 13005, 14739, 14841, 24565, 24735, 28033, 44217, 73695, 74205, 84099, 140165, 221085, 252297, 420495, 476561, 1261485, 1429683, 2382805, 4289049, 7148415, 21445245]

約数ペア:

[(1, 21445245), (3, 7148415), (5, 4289049), (9, 2382805), (15, 1429683), (17, 1261485), (45, 476561), (51, 420495), (85, 252297), (97, 221085), (153, 140165), (255, 84099), (289, 74205), (291, 73695), (485, 44217), (765, 28033), (867, 24735), (873, 24565), (1445, 14841), (1455, 14739), (1649, 13005), (2601, 8245), (4335, 4947), (4365, 4913)]