21357040

素因数分解:

$2^4\times 5^1\times {\mathrm{239}}^1\times {\mathrm{1117}}^1$

素因数の和:1369

約数の個数: 40

約数和(自身を含む): 49907520

約数和(自身を除く): 28550480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 239, 478, 956, 1117, 1195, 1912, 2234, 2390, 3824, 4468, 4780, 5585, 8936, 9560, 11170, 17872, 19120, 22340, 44680, 89360, 266963, 533926, 1067852, 1334815, 2135704, 2669630, 4271408, 5339260, 10678520, 21357040]

約数ペア:

[(1, 21357040), (2, 10678520), (4, 5339260), (5, 4271408), (8, 2669630), (10, 2135704), (16, 1334815), (20, 1067852), (40, 533926), (80, 266963), (239, 89360), (478, 44680), (956, 22340), (1117, 19120), (1195, 17872), (1912, 11170), (2234, 9560), (2390, 8936), (3824, 5585), (4468, 4780)]