21012440

素因数分解:

$2^3\times 5^1\times {\mathrm{541}}^1\times {\mathrm{971}}^1$

素因数の和:1523

約数の個数: 32

約数和(自身を含む): 47414160

約数和(自身を除く): 26401720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 541, 971, 1082, 1942, 2164, 2705, 3884, 4328, 4855, 5410, 7768, 9710, 10820, 19420, 21640, 38840, 525311, 1050622, 2101244, 2626555, 4202488, 5253110, 10506220, 21012440]

約数ペア:

[(1, 21012440), (2, 10506220), (4, 5253110), (5, 4202488), (8, 2626555), (10, 2101244), (20, 1050622), (40, 525311), (541, 38840), (971, 21640), (1082, 19420), (1942, 10820), (2164, 9710), (2705, 7768), (3884, 5410), (4328, 4855)]