20971305

素因数分解:

$3^4\times 5^1\times {\mathrm{53}}^1\times {\mathrm{977}}^1$

素因数の和:1047

約数の個数: 40

約数和(自身を含む): 38341512

約数和(自身を除く): 17370207

約数列:

[1, 3, 5, 9, 15, 27, 45, 53, 81, 135, 159, 265, 405, 477, 795, 977, 1431, 2385, 2931, 4293, 4885, 7155, 8793, 14655, 21465, 26379, 43965, 51781, 79137, 131895, 155343, 258905, 395685, 466029, 776715, 1398087, 2330145, 4194261, 6990435, 20971305]

約数ペア:

[(1, 20971305), (3, 6990435), (5, 4194261), (9, 2330145), (15, 1398087), (27, 776715), (45, 466029), (53, 395685), (81, 258905), (135, 155343), (159, 131895), (265, 79137), (405, 51781), (477, 43965), (795, 26379), (977, 21465), (1431, 14655), (2385, 8793), (2931, 7155), (4293, 4885)]