81391995

素因数分解:

$3^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{149}}^1\times {\mathrm{199}}^1$

素因数の和:420

約数の個数: 48

約数和(自身を含む): 145080000

約数和(自身を除く): 63688005

約数列:

[1, 3, 5, 9, 15, 45, 61, 149, 183, 199, 305, 447, 549, 597, 745, 915, 995, 1341, 1791, 2235, 2745, 2985, 6705, 8955, 9089, 12139, 27267, 29651, 36417, 45445, 60695, 81801, 88953, 109251, 136335, 148255, 182085, 266859, 409005, 444765, 546255, 1334295, 1808711, 5426133, 9043555, 16278399, 27130665, 81391995]

約数ペア:

[(1, 81391995), (3, 27130665), (5, 16278399), (9, 9043555), (15, 5426133), (45, 1808711), (61, 1334295), (149, 546255), (183, 444765), (199, 409005), (305, 266859), (447, 182085), (549, 148255), (597, 136335), (745, 109251), (915, 88953), (995, 81801), (1341, 60695), (1791, 45445), (2235, 36417), (2745, 29651), (2985, 27267), (6705, 12139), (8955, 9089)]