21278075

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{199}}^1$

素因数の和:276

約数の個数: 48

約数和(自身を含む): 33331200

約数和(自身を除く): 12053125

約数列:

[1, 5, 7, 13, 25, 35, 47, 65, 91, 175, 199, 235, 325, 329, 455, 611, 995, 1175, 1393, 1645, 2275, 2587, 3055, 4277, 4975, 6965, 8225, 9353, 12935, 15275, 18109, 21385, 34825, 46765, 64675, 65471, 90545, 106925, 121589, 233825, 327355, 452725, 607945, 851123, 1636775, 3039725, 4255615, 21278075]

約数ペア:

[(1, 21278075), (5, 4255615), (7, 3039725), (13, 1636775), (25, 851123), (35, 607945), (47, 452725), (65, 327355), (91, 233825), (175, 121589), (199, 106925), (235, 90545), (325, 65471), (329, 64675), (455, 46765), (611, 34825), (995, 21385), (1175, 18109), (1393, 15275), (1645, 12935), (2275, 9353), (2587, 8225), (3055, 6965), (4277, 4975)]