21131925

素因数分解:

$3^1\times 5^2\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{149}}^1$

素因数の和:254

約数の個数: 48

約数和(自身を含む): 36902400

約数和(自身を除く): 15770475

約数列:

[1, 3, 5, 15, 25, 31, 61, 75, 93, 149, 155, 183, 305, 447, 465, 745, 775, 915, 1525, 1891, 2235, 2325, 3725, 4575, 4619, 5673, 9089, 9455, 11175, 13857, 23095, 27267, 28365, 45445, 47275, 69285, 115475, 136335, 141825, 227225, 281759, 346425, 681675, 845277, 1408795, 4226385, 7043975, 21131925]

約数ペア:

[(1, 21131925), (3, 7043975), (5, 4226385), (15, 1408795), (25, 845277), (31, 681675), (61, 346425), (75, 281759), (93, 227225), (149, 141825), (155, 136335), (183, 115475), (305, 69285), (447, 47275), (465, 45445), (745, 28365), (775, 27267), (915, 23095), (1525, 13857), (1891, 11175), (2235, 9455), (2325, 9089), (3725, 5673), (4575, 4619)]