21450280

素因数分解:

$2^3\times 5^1\times {\mathrm{263}}^1\times {\mathrm{2039}}^1$

素因数の和:2313

約数の個数: 32

約数和(自身を含む): 48470400

約数和(自身を除く): 27020120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 263, 526, 1052, 1315, 2039, 2104, 2630, 4078, 5260, 8156, 10195, 10520, 16312, 20390, 40780, 81560, 536257, 1072514, 2145028, 2681285, 4290056, 5362570, 10725140, 21450280]

約数ペア:

[(1, 21450280), (2, 10725140), (4, 5362570), (5, 4290056), (8, 2681285), (10, 2145028), (20, 1072514), (40, 536257), (263, 81560), (526, 40780), (1052, 20390), (1315, 16312), (2039, 10520), (2104, 10195), (2630, 8156), (4078, 5260)]