21400925

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{409}}^1$

素因数の和:462

約数の個数: 48

約数和(自身を含む): 34164480

約数和(自身を除く): 12763555

約数列:

[1, 5, 7, 13, 23, 25, 35, 65, 91, 115, 161, 175, 299, 325, 409, 455, 575, 805, 1495, 2045, 2093, 2275, 2863, 4025, 5317, 7475, 9407, 10225, 10465, 14315, 26585, 37219, 47035, 52325, 65849, 71575, 122291, 132925, 186095, 235175, 329245, 611455, 856037, 930475, 1646225, 3057275, 4280185, 21400925]

約数ペア:

[(1, 21400925), (5, 4280185), (7, 3057275), (13, 1646225), (23, 930475), (25, 856037), (35, 611455), (65, 329245), (91, 235175), (115, 186095), (161, 132925), (175, 122291), (299, 71575), (325, 65849), (409, 52325), (455, 47035), (575, 37219), (805, 26585), (1495, 14315), (2045, 10465), (2093, 10225), (2275, 9407), (2863, 7475), (4025, 5317)]