657698980

素因数分解:

$2^2\times 5^1\times {\mathrm{199}}^1\times {\mathrm{257}}^1\times {\mathrm{643}}^1$

素因数の和:1108

約数の個数: 48

約数和(自身を含む): 1395676800

約数和(自身を除く): 737977820

約数列:

[1, 2, 4, 5, 10, 20, 199, 257, 398, 514, 643, 796, 995, 1028, 1285, 1286, 1990, 2570, 2572, 3215, 3980, 5140, 6430, 12860, 51143, 102286, 127957, 165251, 204572, 255715, 255914, 330502, 511430, 511828, 639785, 661004, 826255, 1022860, 1279570, 1652510, 2559140, 3305020, 32884949, 65769898, 131539796, 164424745, 328849490, 657698980]

約数ペア:

[(1, 657698980), (2, 328849490), (4, 164424745), (5, 131539796), (10, 65769898), (20, 32884949), (199, 3305020), (257, 2559140), (398, 1652510), (514, 1279570), (643, 1022860), (796, 826255), (995, 661004), (1028, 639785), (1285, 511828), (1286, 511430), (1990, 330502), (2570, 255914), (2572, 255715), (3215, 204572), (3980, 165251), (5140, 127957), (6430, 102286), (12860, 51143)]