21001995

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{1093}}^1$

素因数の和:1172

約数の個数: 48

約数和(自身を含む): 42324672

約数和(自身を除く): 21322677

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 61, 63, 105, 183, 305, 315, 427, 549, 915, 1093, 1281, 2135, 2745, 3279, 3843, 5465, 6405, 7651, 9837, 16395, 19215, 22953, 38255, 49185, 66673, 68859, 114765, 200019, 333365, 344295, 466711, 600057, 1000095, 1400133, 2333555, 3000285, 4200399, 7000665, 21001995]

約数ペア:

[(1, 21001995), (3, 7000665), (5, 4200399), (7, 3000285), (9, 2333555), (15, 1400133), (21, 1000095), (35, 600057), (45, 466711), (61, 344295), (63, 333365), (105, 200019), (183, 114765), (305, 68859), (315, 66673), (427, 49185), (549, 38255), (915, 22953), (1093, 19215), (1281, 16395), (2135, 9837), (2745, 7651), (3279, 6405), (3843, 5465)]