21250480

素因数分解:

$2^4\times 5^1\times {\mathrm{491}}^1\times {\mathrm{541}}^1$

素因数の和:1045

約数の個数: 40

約数和(自身を含む): 49599504

約数和(自身を除く): 28349024

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 491, 541, 982, 1082, 1964, 2164, 2455, 2705, 3928, 4328, 4910, 5410, 7856, 8656, 9820, 10820, 19640, 21640, 39280, 43280, 265631, 531262, 1062524, 1328155, 2125048, 2656310, 4250096, 5312620, 10625240, 21250480]

約数ペア:

[(1, 21250480), (2, 10625240), (4, 5312620), (5, 4250096), (8, 2656310), (10, 2125048), (16, 1328155), (20, 1062524), (40, 531262), (80, 265631), (491, 43280), (541, 39280), (982, 21640), (1082, 19640), (1964, 10820), (2164, 9820), (2455, 8656), (2705, 7856), (3928, 5410), (4328, 4910)]