20885775

素因数分解:

$3^1\times 5^2\times {\mathrm{17}}^1\times {\mathrm{16381}}^1$

素因数の和:16411

約数の個数: 24

約数和(自身を含む): 36564624

約数和(自身を除く): 15678849

約数列:

[1, 3, 5, 15, 17, 25, 51, 75, 85, 255, 425, 1275, 16381, 49143, 81905, 245715, 278477, 409525, 835431, 1228575, 1392385, 4177155, 6961925, 20885775]

約数ペア:

[(1, 20885775), (3, 6961925), (5, 4177155), (15, 1392385), (17, 1228575), (25, 835431), (51, 409525), (75, 278477), (85, 245715), (255, 81905), (425, 49143), (1275, 16381)]