20305040

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{101}}^1\times {\mathrm{359}}^1$

素因数の和:480

約数の個数: 80

約数和(自身を含む): 54639360

約数和(自身を除く): 34334320

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 101, 112, 140, 202, 280, 359, 404, 505, 560, 707, 718, 808, 1010, 1414, 1436, 1616, 1795, 2020, 2513, 2828, 2872, 3535, 3590, 4040, 5026, 5656, 5744, 7070, 7180, 8080, 10052, 11312, 12565, 14140, 14360, 20104, 25130, 28280, 28720, 36259, 40208, 50260, 56560, 72518, 100520, 145036, 181295, 201040, 253813, 290072, 362590, 507626, 580144, 725180, 1015252, 1269065, 1450360, 2030504, 2538130, 2900720, 4061008, 5076260, 10152520, 20305040]

約数ペア:

[(1, 20305040), (2, 10152520), (4, 5076260), (5, 4061008), (7, 2900720), (8, 2538130), (10, 2030504), (14, 1450360), (16, 1269065), (20, 1015252), (28, 725180), (35, 580144), (40, 507626), (56, 362590), (70, 290072), (80, 253813), (101, 201040), (112, 181295), (140, 145036), (202, 100520), (280, 72518), (359, 56560), (404, 50260), (505, 40208), (560, 36259), (707, 28720), (718, 28280), (808, 25130), (1010, 20104), (1414, 14360), (1436, 14140), (1616, 12565), (1795, 11312), (2020, 10052), (2513, 8080), (2828, 7180), (2872, 7070), (3535, 5744), (3590, 5656), (4040, 5026)]