21144725

素因数分解:

$5^2\times 7^2\times {\mathrm{41}}^1\times {\mathrm{421}}^1$

素因数の和:486

約数の個数: 36

約数和(自身を含む): 31318308

約数和(自身を除く): 10173583

約数列:

[1, 5, 7, 25, 35, 41, 49, 175, 205, 245, 287, 421, 1025, 1225, 1435, 2009, 2105, 2947, 7175, 10045, 10525, 14735, 17261, 20629, 50225, 73675, 86305, 103145, 120827, 431525, 515725, 604135, 845789, 3020675, 4228945, 21144725]

約数ペア:

[(1, 21144725), (5, 4228945), (7, 3020675), (25, 845789), (35, 604135), (41, 515725), (49, 431525), (175, 120827), (205, 103145), (245, 86305), (287, 73675), (421, 50225), (1025, 20629), (1225, 17261), (1435, 14735), (2009, 10525), (2105, 10045), (2947, 7175)]