21069885

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{1559}}^1$

素因数の和:1637

約数の個数: 32

約数和(自身を含む): 36391680

約数和(自身を除く): 15321795

約数列:

[1, 3, 5, 15, 17, 51, 53, 85, 159, 255, 265, 795, 901, 1559, 2703, 4505, 4677, 7795, 13515, 23385, 26503, 79509, 82627, 132515, 247881, 397545, 413135, 1239405, 1404659, 4213977, 7023295, 21069885]

約数ペア:

[(1, 21069885), (3, 7023295), (5, 4213977), (15, 1404659), (17, 1239405), (51, 413135), (53, 397545), (85, 247881), (159, 132515), (255, 82627), (265, 79509), (795, 26503), (901, 23385), (1559, 13515), (2703, 7795), (4505, 4677)]