20989000

素因数分解:

$2^3\times 5^3\times {\mathrm{139}}^1\times {\mathrm{151}}^1$

素因数の和:311

約数の個数: 64

約数和(自身を含む): 49795200

約数和(自身を除く): 28806200

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 139, 151, 200, 250, 278, 302, 500, 556, 604, 695, 755, 1000, 1112, 1208, 1390, 1510, 2780, 3020, 3475, 3775, 5560, 6040, 6950, 7550, 13900, 15100, 17375, 18875, 20989, 27800, 30200, 34750, 37750, 41978, 69500, 75500, 83956, 104945, 139000, 151000, 167912, 209890, 419780, 524725, 839560, 1049450, 2098900, 2623625, 4197800, 5247250, 10494500, 20989000]

約数ペア:

[(1, 20989000), (2, 10494500), (4, 5247250), (5, 4197800), (8, 2623625), (10, 2098900), (20, 1049450), (25, 839560), (40, 524725), (50, 419780), (100, 209890), (125, 167912), (139, 151000), (151, 139000), (200, 104945), (250, 83956), (278, 75500), (302, 69500), (500, 41978), (556, 37750), (604, 34750), (695, 30200), (755, 27800), (1000, 20989), (1112, 18875), (1208, 17375), (1390, 15100), (1510, 13900), (2780, 7550), (3020, 6950), (3475, 6040), (3775, 5560)]