21468560

素因数分解:

$2^4\times 5^1\times {\mathrm{101}}^1\times {\mathrm{2657}}^1$

素因数の和:2771

約数の個数: 40

約数和(自身を含む): 50427576

約数和(自身を除く): 28959016

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 101, 202, 404, 505, 808, 1010, 1616, 2020, 2657, 4040, 5314, 8080, 10628, 13285, 21256, 26570, 42512, 53140, 106280, 212560, 268357, 536714, 1073428, 1341785, 2146856, 2683570, 4293712, 5367140, 10734280, 21468560]

約数ペア:

[(1, 21468560), (2, 10734280), (4, 5367140), (5, 4293712), (8, 2683570), (10, 2146856), (16, 1341785), (20, 1073428), (40, 536714), (80, 268357), (101, 212560), (202, 106280), (404, 53140), (505, 42512), (808, 26570), (1010, 21256), (1616, 13285), (2020, 10628), (2657, 8080), (4040, 5314)]