21317840

素因数分解:

$2^4\times 5^1\times {\mathrm{439}}^1\times {\mathrm{607}}^1$

素因数の和:1059

約数の個数: 40

約数和(自身を含む): 49758720

約数和(自身を除く): 28440880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 439, 607, 878, 1214, 1756, 2195, 2428, 3035, 3512, 4390, 4856, 6070, 7024, 8780, 9712, 12140, 17560, 24280, 35120, 48560, 266473, 532946, 1065892, 1332365, 2131784, 2664730, 4263568, 5329460, 10658920, 21317840]

約数ペア:

[(1, 21317840), (2, 10658920), (4, 5329460), (5, 4263568), (8, 2664730), (10, 2131784), (16, 1332365), (20, 1065892), (40, 532946), (80, 266473), (439, 48560), (607, 35120), (878, 24280), (1214, 17560), (1756, 12140), (2195, 9712), (2428, 8780), (3035, 7024), (3512, 6070), (4390, 4856)]