21195280

素因数分解:

$2^4\times 5^1\times {\mathrm{307}}^1\times {\mathrm{863}}^1$

素因数の和:1183

約数の個数: 40

約数和(自身を含む): 49496832

約数和(自身を除く): 28301552

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 307, 614, 863, 1228, 1535, 1726, 2456, 3070, 3452, 4315, 4912, 6140, 6904, 8630, 12280, 13808, 17260, 24560, 34520, 69040, 264941, 529882, 1059764, 1324705, 2119528, 2649410, 4239056, 5298820, 10597640, 21195280]

約数ペア:

[(1, 21195280), (2, 10597640), (4, 5298820), (5, 4239056), (8, 2649410), (10, 2119528), (16, 1324705), (20, 1059764), (40, 529882), (80, 264941), (307, 69040), (614, 34520), (863, 24560), (1228, 17260), (1535, 13808), (1726, 12280), (2456, 8630), (3070, 6904), (3452, 6140), (4315, 4912)]