21687280

素因数分解:

$2^4\times 5^1\times {\mathrm{173}}^1\times {\mathrm{1567}}^1$

素因数の和:1753

約数の個数: 40

約数和(自身を含む): 50746752

約数和(自身を除く): 29059472

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 173, 346, 692, 865, 1384, 1567, 1730, 2768, 3134, 3460, 6268, 6920, 7835, 12536, 13840, 15670, 25072, 31340, 62680, 125360, 271091, 542182, 1084364, 1355455, 2168728, 2710910, 4337456, 5421820, 10843640, 21687280]

約数ペア:

[(1, 21687280), (2, 10843640), (4, 5421820), (5, 4337456), (8, 2710910), (10, 2168728), (16, 1355455), (20, 1084364), (40, 542182), (80, 271091), (173, 125360), (346, 62680), (692, 31340), (865, 25072), (1384, 15670), (1567, 13840), (1730, 12536), (2768, 7835), (3134, 6920), (3460, 6268)]