21143025

素因数分解:

$3^4\times 5^2\times {\mathrm{53}}^1\times {\mathrm{197}}^1$

素因数の和:272

約数の個数: 60

約数和(自身を含む): 40105692

約数和(自身を除く): 18962667

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 53, 75, 81, 135, 159, 197, 225, 265, 405, 477, 591, 675, 795, 985, 1325, 1431, 1773, 2025, 2385, 2955, 3975, 4293, 4925, 5319, 7155, 8865, 10441, 11925, 14775, 15957, 21465, 26595, 31323, 35775, 44325, 52205, 79785, 93969, 107325, 132975, 156615, 261025, 281907, 398925, 469845, 783075, 845721, 1409535, 2349225, 4228605, 7047675, 21143025]

約数ペア:

[(1, 21143025), (3, 7047675), (5, 4228605), (9, 2349225), (15, 1409535), (25, 845721), (27, 783075), (45, 469845), (53, 398925), (75, 281907), (81, 261025), (135, 156615), (159, 132975), (197, 107325), (225, 93969), (265, 79785), (405, 52205), (477, 44325), (591, 35775), (675, 31323), (795, 26595), (985, 21465), (1325, 15957), (1431, 14775), (1773, 11925), (2025, 10441), (2385, 8865), (2955, 7155), (3975, 5319), (4293, 4925)]