21399125

素因数分解:

$5^3\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{197}}^1$

素因数の和:302

約数の個数: 32

約数和(自身を含む): 29652480

約数和(自身を除く): 8253355

約数列:

[1, 5, 11, 25, 55, 79, 125, 197, 275, 395, 869, 985, 1375, 1975, 2167, 4345, 4925, 9875, 10835, 15563, 21725, 24625, 54175, 77815, 108625, 171193, 270875, 389075, 855965, 1945375, 4279825, 21399125]

約数ペア:

[(1, 21399125), (5, 4279825), (11, 1945375), (25, 855965), (55, 389075), (79, 270875), (125, 171193), (197, 108625), (275, 77815), (395, 54175), (869, 24625), (985, 21725), (1375, 15563), (1975, 10835), (2167, 9875), (4345, 4925)]