21552020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{257}}^1\times {\mathrm{599}}^1$

素因数の和:872

約数の個数: 48

約数和(自身を含む): 52012800

約数和(自身を除く): 30460780

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 257, 514, 599, 1028, 1198, 1285, 1799, 2396, 2570, 2995, 3598, 4193, 5140, 5990, 7196, 8386, 8995, 11980, 16772, 17990, 20965, 35980, 41930, 83860, 153943, 307886, 615772, 769715, 1077601, 1539430, 2155202, 3078860, 4310404, 5388005, 10776010, 21552020]

約数ペア:

[(1, 21552020), (2, 10776010), (4, 5388005), (5, 4310404), (7, 3078860), (10, 2155202), (14, 1539430), (20, 1077601), (28, 769715), (35, 615772), (70, 307886), (140, 153943), (257, 83860), (514, 41930), (599, 35980), (1028, 20965), (1198, 17990), (1285, 16772), (1799, 11980), (2396, 8995), (2570, 8386), (2995, 7196), (3598, 5990), (4193, 5140)]