19981840

素因数分解:

$2^4\times 5^1\times {\mathrm{101}}^1\times {\mathrm{2473}}^1$

素因数の和:2587

約数の個数: 40

約数和(自身を含む): 46936728

約数和(自身を除く): 26954888

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 101, 202, 404, 505, 808, 1010, 1616, 2020, 2473, 4040, 4946, 8080, 9892, 12365, 19784, 24730, 39568, 49460, 98920, 197840, 249773, 499546, 999092, 1248865, 1998184, 2497730, 3996368, 4995460, 9990920, 19981840]

約数ペア:

[(1, 19981840), (2, 9990920), (4, 4995460), (5, 3996368), (8, 2497730), (10, 1998184), (16, 1248865), (20, 999092), (40, 499546), (80, 249773), (101, 197840), (202, 98920), (404, 49460), (505, 39568), (808, 24730), (1010, 19784), (1616, 12365), (2020, 9892), (2473, 8080), (4040, 4946)]