20991243

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{4523}}^1$

素因数の和:4563

約数の個数: 32

約数和(自身を含む): 36481536

約数和(自身を除く): 15490293

約数列:

[1, 3, 7, 13, 17, 21, 39, 51, 91, 119, 221, 273, 357, 663, 1547, 4523, 4641, 13569, 31661, 58799, 76891, 94983, 176397, 230673, 411593, 538237, 999583, 1234779, 1614711, 2998749, 6997081, 20991243]

約数ペア:

[(1, 20991243), (3, 6997081), (7, 2998749), (13, 1614711), (17, 1234779), (21, 999583), (39, 538237), (51, 411593), (91, 230673), (119, 176397), (221, 94983), (273, 76891), (357, 58799), (663, 31661), (1547, 13569), (4523, 4641)]