21504405

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{499}}^1$

素因数の和:550

約数の個数: 48

約数和(自身を含む): 39528000

約数和(自身を除く): 18023595

約数列:

[1, 3, 5, 13, 15, 17, 39, 51, 65, 85, 169, 195, 221, 255, 499, 507, 663, 845, 1105, 1497, 2495, 2535, 2873, 3315, 6487, 7485, 8483, 8619, 14365, 19461, 25449, 32435, 42415, 43095, 84331, 97305, 110279, 127245, 252993, 330837, 421655, 551395, 1264965, 1433627, 1654185, 4300881, 7168135, 21504405]

約数ペア:

[(1, 21504405), (3, 7168135), (5, 4300881), (13, 1654185), (15, 1433627), (17, 1264965), (39, 551395), (51, 421655), (65, 330837), (85, 252993), (169, 127245), (195, 110279), (221, 97305), (255, 84331), (499, 43095), (507, 42415), (663, 32435), (845, 25449), (1105, 19461), (1497, 14365), (2495, 8619), (2535, 8483), (2873, 7485), (3315, 6487)]