21170721

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{809}}^1$

素因数の和:897

約数の個数: 32

約数和(自身を含む): 33747840

約数和(自身を除く): 12577119

約数列:

[1, 3, 11, 13, 33, 39, 61, 143, 183, 429, 671, 793, 809, 2013, 2379, 2427, 8723, 8899, 10517, 26169, 26697, 31551, 49349, 115687, 148047, 347061, 542839, 641537, 1628517, 1924611, 7056907, 21170721]

約数ペア:

[(1, 21170721), (3, 7056907), (11, 1924611), (13, 1628517), (33, 641537), (39, 542839), (61, 347061), (143, 148047), (183, 115687), (429, 49349), (671, 31551), (793, 26697), (809, 26169), (2013, 10517), (2379, 8899), (2427, 8723)]