21507880

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4933}}^1$

素因数の和:5053

約数の個数: 32

約数和(自身を含む): 48846600

約数和(自身を除く): 27338720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4933, 9866, 19732, 24665, 39464, 49330, 98660, 197320, 537697, 1075394, 2150788, 2688485, 4301576, 5376970, 10753940, 21507880]

約数ペア:

[(1, 21507880), (2, 10753940), (4, 5376970), (5, 4301576), (8, 2688485), (10, 2150788), (20, 1075394), (40, 537697), (109, 197320), (218, 98660), (436, 49330), (545, 39464), (872, 24665), (1090, 19732), (2180, 9866), (4360, 4933)]