21287800

素因数分解:

$2^3\times 5^2\times {\mathrm{163}}^1\times {\mathrm{653}}^1$

素因数の和:832

約数の個数: 48

約数和(自身を含む): 49874040

約数和(自身を除く): 28586240

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 163, 200, 326, 652, 653, 815, 1304, 1306, 1630, 2612, 3260, 3265, 4075, 5224, 6520, 6530, 8150, 13060, 16300, 16325, 26120, 32600, 32650, 65300, 106439, 130600, 212878, 425756, 532195, 851512, 1064390, 2128780, 2660975, 4257560, 5321950, 10643900, 21287800]

約数ペア:

[(1, 21287800), (2, 10643900), (4, 5321950), (5, 4257560), (8, 2660975), (10, 2128780), (20, 1064390), (25, 851512), (40, 532195), (50, 425756), (100, 212878), (163, 130600), (200, 106439), (326, 65300), (652, 32650), (653, 32600), (815, 26120), (1304, 16325), (1306, 16300), (1630, 13060), (2612, 8150), (3260, 6530), (3265, 6520), (4075, 5224)]