21518865

素因数分解:

$3^5\times 5^1\times {\mathrm{89}}^1\times {\mathrm{199}}^1$

素因数の和:308

約数の個数: 48

約数和(自身を含む): 39312000

約数和(自身を除く): 17793135

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 89, 135, 199, 243, 267, 405, 445, 597, 801, 995, 1215, 1335, 1791, 2403, 2985, 4005, 5373, 7209, 8955, 12015, 16119, 17711, 21627, 26865, 36045, 48357, 53133, 80595, 88555, 108135, 159399, 241785, 265665, 478197, 796995, 1434591, 2390985, 4303773, 7172955, 21518865]

約数ペア:

[(1, 21518865), (3, 7172955), (5, 4303773), (9, 2390985), (15, 1434591), (27, 796995), (45, 478197), (81, 265665), (89, 241785), (135, 159399), (199, 108135), (243, 88555), (267, 80595), (405, 53133), (445, 48357), (597, 36045), (801, 26865), (995, 21627), (1215, 17711), (1335, 16119), (1791, 12015), (2403, 8955), (2985, 7209), (4005, 5373)]