21400605

素因数分解:

$3^4\times 5^1\times {\mathrm{53}}^1\times {\mathrm{997}}^1$

素因数の和:1067

約数の個数: 40

約数和(自身を含む): 39125592

約数和(自身を除く): 17724987

約数列:

[1, 3, 5, 9, 15, 27, 45, 53, 81, 135, 159, 265, 405, 477, 795, 997, 1431, 2385, 2991, 4293, 4985, 7155, 8973, 14955, 21465, 26919, 44865, 52841, 80757, 134595, 158523, 264205, 403785, 475569, 792615, 1426707, 2377845, 4280121, 7133535, 21400605]

約数ペア:

[(1, 21400605), (3, 7133535), (5, 4280121), (9, 2377845), (15, 1426707), (27, 792615), (45, 475569), (53, 403785), (81, 264205), (135, 158523), (159, 134595), (265, 80757), (405, 52841), (477, 44865), (795, 26919), (997, 21465), (1431, 14955), (2385, 8973), (2991, 7155), (4293, 4985)]