21019995

素因数分解:

$3^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{1861}}^1$

素因数の和:2123

約数の個数: 24

約数和(自身を含む): 36599472

約数和(自身を除く): 15579477

約数列:

[1, 3, 5, 9, 15, 45, 251, 753, 1255, 1861, 2259, 3765, 5583, 9305, 11295, 16749, 27915, 83745, 467111, 1401333, 2335555, 4203999, 7006665, 21019995]

約数ペア:

[(1, 21019995), (3, 7006665), (5, 4203999), (9, 2335555), (15, 1401333), (45, 467111), (251, 83745), (753, 27915), (1255, 16749), (1861, 11295), (2259, 9305), (3765, 5583)]