21491487

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{101}}^1$

素因数の和:221

約数の個数: 40

約数和(自身を含む): 33767712

約数和(自身を除く): 12276225

約数列:

[1, 3, 9, 27, 37, 71, 81, 101, 111, 213, 303, 333, 639, 909, 999, 1917, 2627, 2727, 2997, 3737, 5751, 7171, 7881, 8181, 11211, 21513, 23643, 33633, 64539, 70929, 100899, 193617, 212787, 265327, 302697, 580851, 795981, 2387943, 7163829, 21491487]

約数ペア:

[(1, 21491487), (3, 7163829), (9, 2387943), (27, 795981), (37, 580851), (71, 302697), (81, 265327), (101, 212787), (111, 193617), (213, 100899), (303, 70929), (333, 64539), (639, 33633), (909, 23643), (999, 21513), (1917, 11211), (2627, 8181), (2727, 7881), (2997, 7171), (3737, 5751)]