21317931

素因数分解:

$3^3\times {\mathrm{47}}^1\times {\mathrm{107}}^1\times {\mathrm{157}}^1$

素因数の和:320

約数の個数: 32

約数和(自身を含む): 32762880

約数和(自身を除く): 11444949

約数列:

[1, 3, 9, 27, 47, 107, 141, 157, 321, 423, 471, 963, 1269, 1413, 2889, 4239, 5029, 7379, 15087, 16799, 22137, 45261, 50397, 66411, 135783, 151191, 199233, 453573, 789553, 2368659, 7105977, 21317931]

約数ペア:

[(1, 21317931), (3, 7105977), (9, 2368659), (27, 789553), (47, 453573), (107, 199233), (141, 151191), (157, 135783), (321, 66411), (423, 50397), (471, 45261), (963, 22137), (1269, 16799), (1413, 15087), (2889, 7379), (4239, 5029)]