20890960

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15361}}^1$

素因数の和:15391

約数の個数: 40

約数和(自身を含む): 51431976

約数和(自身を除く): 30541016

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15361, 30722, 61444, 76805, 122888, 153610, 245776, 261137, 307220, 522274, 614440, 1044548, 1228880, 1305685, 2089096, 2611370, 4178192, 5222740, 10445480, 20890960]

約数ペア:

[(1, 20890960), (2, 10445480), (4, 5222740), (5, 4178192), (8, 2611370), (10, 2089096), (16, 1305685), (17, 1228880), (20, 1044548), (34, 614440), (40, 522274), (68, 307220), (80, 261137), (85, 245776), (136, 153610), (170, 122888), (272, 76805), (340, 61444), (680, 30722), (1360, 15361)]