21187375

素因数分解:

$5^3\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{811}}^1$

素因数の和:856

約数の個数: 32

約数和(自身を含む): 30401280

約数和(自身を除く): 9213905

約数列:

[1, 5, 11, 19, 25, 55, 95, 125, 209, 275, 475, 811, 1045, 1375, 2375, 4055, 5225, 8921, 15409, 20275, 26125, 44605, 77045, 101375, 169499, 223025, 385225, 847495, 1115125, 1926125, 4237475, 21187375]

約数ペア:

[(1, 21187375), (5, 4237475), (11, 1926125), (19, 1115125), (25, 847495), (55, 385225), (95, 223025), (125, 169499), (209, 101375), (275, 77045), (475, 44605), (811, 26125), (1045, 20275), (1375, 15409), (2375, 8921), (4055, 5225)]